Quantitative Research SOHP503 Project

Choose a study mode

Play Quiz
Study Flashcards
Spaced Repetition
Chat to Lesson

Podcast

Play an AI-generated podcast conversation about this lesson

Questions and Answers

What was the effect of the intervention on health-related quality of life in comparison to the control arm?

  • There was no difference between the groups.
  • The control arm showed greater health-related quality of life improvement.
  • The intervention significantly decreased health-related quality of life.
  • The intervention improved health-related quality of life. (correct)

What was the significance level (p-value) for the between-arm difference in health-related quality of life?

  • p = 0.04 (correct)
  • p = 0.05
  • p = 0.03
  • p = 0.01

What can be concluded about the glycated hemoglobin levels between the groups?

  • They differed but the difference was not significant. (correct)
  • They were not measured.
  • They were significantly different.
  • The intervention group showed lower levels.

Given the findings, what is true about the meaningfulness of the significant difference in health-related quality of life?

<p>The difference was statistically significant but not meaningful. (C)</p> Signup and view all the answers

What information is lacking regarding the sample size in the study?

<p>Whether the sample size was large enough is unknown. (D)</p> Signup and view all the answers

What is a key aspect of virtual meeting etiquette for SoHP503?

<p>Dress appropriately and ensure your surroundings are tidy. (D)</p> Signup and view all the answers

Which of the following is NOT a learning objective for understanding quantitative data?

<p>Collect data from qualitative sources. (C)</p> Signup and view all the answers

In the context of numerical importance, what does a score of 5/10 indicate?

<p>Represents 50% of students scoring at least this amount. (A)</p> Signup and view all the answers

What is the main advantage of using a scatter plot over a frequency table when representing two numerical variables?

<p>Scatter plots make it easier to identify trends and relationships. (B)</p> Signup and view all the answers

What is essential when positioning your camera in a virtual meeting?

<p>Ensuring your entire head is visible. (B)</p> Signup and view all the answers

In the context of the provided data, what should be done if the scatter plot is too crowded?

<p>Use a frequency table to present the data more clearly. (D)</p> Signup and view all the answers

Which statement best describes the importance of numerical context in data representation?

<p>It adds depth and relevance through proper scoring context. (D)</p> Signup and view all the answers

Which data types are represented effectively in a scatter plot according to the information given?

<p>Two numerical variables and one categorical variable. (C)</p> Signup and view all the answers

What is the highest individual score mentioned in the context of different scoring systems?

<p>15/100 (B)</p> Signup and view all the answers

What is indicated by a score of 5/100?

<p>At least half of students achieved a score higher than this. (C)</p> Signup and view all the answers

What is a recommended practice if a scatter plot is overly complicated because of too many categories?

<p>Create separate scatter plots for each category. (B)</p> Signup and view all the answers

What practice is advised when not actively speaking during a virtual meeting?

<p>Mute your microphone to avoid background noise. (A)</p> Signup and view all the answers

If a dataset includes age and height data along with eye color, what kind of plot would best demonstrate relationships among these variables?

<p>A scatter plot with color-coded categories for eye color. (B)</p> Signup and view all the answers

When is it appropriate to choose a table over a scatter plot for data representation?

<p>When clear comparison among multiple categories is needed. (C)</p> Signup and view all the answers

Which conclusion can be drawn about the use of scatter plots from the data?

<p>They can display two numerical variables with an added categorical dimension. (D)</p> Signup and view all the answers

What specific data does the scatter plot mentioned suggest for eye color categorization?

<p>Eye color categories should be colored in the scatter plot. (D)</p> Signup and view all the answers

Which of the following statements best defines numerical data?

<p>Data that is quantifiable and expressed in numbers (D)</p> Signup and view all the answers

What does ordinal data represent?

<p>Ordered narrative data with rankings (B)</p> Signup and view all the answers

Which of the following is NOT a common descriptive analysis technique?

<p>Variance (A)</p> Signup and view all the answers

In a frequency table regarding eye color and likeliness to watch horror movies, what does a count represent?

<p>The number of times each eye color category appears in relation to horror movie preferences (D)</p> Signup and view all the answers

How does nominal data differ from ordinal data?

<p>Nominal data consists of non-ordered categories, while ordinal data involves ranking. (C)</p> Signup and view all the answers

What was the primary objective of the study involving the My Diabetes Coach app?

<p>To evaluate the effectiveness of the app for diabetes self-management. (A)</p> Signup and view all the answers

Which method would best express the concept of central tendency?

<p>The mode of a set of data (C)</p> Signup and view all the answers

Which outcome measure was NOT included in the study?

<p>Weight loss percentage (D)</p> Signup and view all the answers

When analyzing likeliness to watch horror movies using a cross-tab frequency table, what key characteristic is being assessed?

<p>The correlation between two categorical variables (B)</p> Signup and view all the answers

What was the total number of adults randomized in the study?

<p>187 adults (A)</p> Signup and view all the answers

Which example best illustrates nominal data?

<p>Colors of cars owned (C)</p> Signup and view all the answers

What is the primary function of descriptive statistics?

<p>To describe and summarize the collected data (A)</p> Signup and view all the answers

What was the main finding regarding the change in HbA1c levels between the intervention and control groups?

<p>Both groups showed reductions, but the difference was not statistically significant. (D)</p> Signup and view all the answers

What was the observed change in health-related quality of life (HRQoL) in the intervention arm?

<p>HRQoL scores improved compared to the control arm. (A)</p> Signup and view all the answers

Frequency analysis in research is primarily concerned with what aspect of data?

<p>Counting how many times each value occurs (A)</p> Signup and view all the answers

How long was the duration of the study tracking the app's effectiveness?

<p>12 months (A)</p> Signup and view all the answers

What was the p-value associated with the change in HbA1c indicating its statistical significance?

<p>p = 0.83 (A)</p> Signup and view all the answers

How were the adults with type 2 diabetes allocated to either group in the study?

<p>They were randomized into intervention and control arms. (B)</p> Signup and view all the answers

What does a significant p-value indicate in a statistical analysis?

<p>There is a statistically significant difference. (B)</p> Signup and view all the answers

Which condition is necessary for applying parametric tests?

<p>Data is linear. (C)</p> Signup and view all the answers

What does a correlation coefficient of 0.9 indicate?

<p>A strong positive correlation. (B)</p> Signup and view all the answers

Which of the following statements is true regarding correlation and causation?

<p>Correlation does not imply causation. (D)</p> Signup and view all the answers

What is a primary assumption for performing a t-test?

<p>The data must meet normality assumptions. (D)</p> Signup and view all the answers

In a scatter plot representing a positive correlation, what is the expected relationship between the variables?

<p>Both variables increase together. (B)</p> Signup and view all the answers

What characterizes non-parametric statistics compared to parametric statistics?

<p>They do not require a linear relationship. (A)</p> Signup and view all the answers

What would be an example of a strong negative correlation?

<p>-0.9 (D)</p> Signup and view all the answers

In correlation research, what must be avoided regarding the relationship of data points?

<p>Data should not have multiple directional relationships. (C)</p> Signup and view all the answers

Which of the following is NOT an assumption for Pearson’s r?

<p>Data is not normally distributed. (C)</p> Signup and view all the answers

What distinguishes a significant p-value from a practically useful difference?

<p>Significant p-value concerns statistical relevance, while practical difference is about real-world application. (A)</p> Signup and view all the answers

What describes the difference between a significant difference and a meaningful difference?

<p>Significant difference refers to statistical findings, while meaningful difference relates to practical usefulness. (A)</p> Signup and view all the answers

Flashcards

Descriptive statistics

Describes the data you've collected.

Numerical data

Type of data where values are numerical.

Ordinal data

Type of data where values are ordered categories.

Nominal data

Type of data where values are unordered categories.

Signup and view all the flashcards

Frequency table

A table showing the count of occurrences for each value in a dataset.

Signup and view all the flashcards

Cross-tab frequency table

A table showing the frequency distribution of two or more categorical variables.

Signup and view all the flashcards

Central tendency

A descriptive statistics technique that measures central tendency, like mean, median, and mode.

Signup and view all the flashcards

Distribution

A descriptive statistics technique that describes the distribution of data, like range, variance, and standard deviation.

Signup and view all the flashcards

Mean difference

A descriptive statistics technique that compares the means of two groups.

Signup and view all the flashcards

p-value

A statistical value indicating the likelihood of obtaining observed results if there were truly no difference between groups.

Signup and view all the flashcards

Between-arm difference

A measure of how much a treatment or intervention affects a particular outcome. It's calculated as the difference in outcome between the intervention group and the control group.

Signup and view all the flashcards

t-test

A statistical test that examines the difference in means between two groups. It's used to determine if the groups are significantly different.

Signup and view all the flashcards

Glycated hemoglobin (HbA1c)

A measure of the average glucose levels in your blood over a period of time. It's used to monitor diabetes management.

Signup and view all the flashcards

Health-related quality of life (HRQoL)

A measure of a person's overall well-being, taking into account physical, mental, and social aspects. It's often used in healthcare to assess the impact of treatments or interventions.

Signup and view all the flashcards

Scatter Plot

A visual representation of data points where the horizontal axis represents one numerical variable, and the vertical axis represents another numerical variable.

Signup and view all the flashcards

Visual Representation

A type of visual representation that displays the relationship between two or more numerical variables. Often used to identify trends or patterns in the data.

Signup and view all the flashcards

Numerical Variable

A data point used to represent a measured value in a dataset.

Signup and view all the flashcards

Categorical Variable

A variable that can be categorized into groups, such as eye color or gender.

Signup and view all the flashcards

Trend Line

A visual representation that displays the trend or the relationship between two numerical variables, visually highlighting the direction and strength of the association.

Signup and view all the flashcards

Scatter Plot with Trend Lines Colored by Category

A plot that displays two numerical variables and one categorical variable, with the data points colored based on the categorical variable, allowing for visual analysis of relationships across different categories.

Signup and view all the flashcards

Choosing Data Visualization

Choosing the most appropriate type of data visualization for the given data and analysis objective.

Signup and view all the flashcards

What is the goal of Quantitative Research?

Quantitative Research enables the analysis and interpretation of numerical data, drawing conclusions from the results to answer research questions.

Signup and view all the flashcards

What are Descriptive Statistics?

Descriptive statistics summarize the key features of a data set, allowing researchers to understand the distribution, central tendency, and variability of the data.

Signup and view all the flashcards

What are Inferential Statistics?

Inferential statistics allow researchers to draw conclusions about a population based on a sample of data, making generalizations beyond the observed data.

Signup and view all the flashcards

Why is Data Visualization important in Quantitative Research?

Data visualization refers to the presentation of data in a graphical format, using charts, graphs, and other visual aids to communicate insights and patterns.

Signup and view all the flashcards

What is 'Critically Appraising' Statistical Techniques?

It refers to the process of critically evaluating the limitations and strengths of statistical techniques, considering factors like appropriateness for the research design and the potential for bias.

Signup and view all the flashcards

What is Numerical Context?

The numerical context refers to the meaning and significance of a number in relation to its scale, units, and reference points. This is essential for understanding the magnitude and implications of the data.

Signup and view all the flashcards

What is Topic Context?

The topic context refers to the specific research area or domain to which the data pertains, providing context for interpreting findings and understanding their implications.

Signup and view all the flashcards

Why is Quantitative Research a valuable approach?

Quantitative Research methods provide researchers with a systematic approach to collect, analyze, and interpret numerical data, leading to objective findings and conclusions.

Signup and view all the flashcards

Independent Variable

The variable that is changed or manipulated in an experiment, e.g., type of diabetes care received (MDC app vs. usual care)

Signup and view all the flashcards

Dependent Variable

The variable that is measured in an experiment to see if there's a change, e.g., HbA1c levels, health-related quality of life

Signup and view all the flashcards

Intervention Group

A group in an experiment that receives the treatment or intervention being studied.

Signup and view all the flashcards

Control Group

A group in an experiment that does not receive the treatment or intervention being studied.

Signup and view all the flashcards

Randomization

The process of assigning participants to different groups in a study randomly.

Signup and view all the flashcards

HbA1c

A measurement of average blood sugar levels over a period of time, used to assess diabetes control

Signup and view all the flashcards

What is a p-value?

A p-value is a statistical measure that indicates the probability of observing a result as extreme as the one obtained, assuming the null hypothesis is true. A lower p-value (typically less than 0.05) suggests that the observed result is unlikely to have occurred by chance, providing evidence to reject the null hypothesis.

Signup and view all the flashcards

What is Statistical Significance?

Statistical significance refers to the likelihood of observing a result as extreme as the one obtained, assuming the null hypothesis is true. A statistically significant result has a low p-value (typically less than 0.05), suggesting that the observed result is unlikely to have occurred by chance.

Signup and view all the flashcards

What is a 'Meaningful Difference'?

A meaningful difference is a statistically significant difference that is also practically relevant. It refers to the real-world impact or importance of the observed difference.

Signup and view all the flashcards

What are Parametric Statistics?

Parametric statistics rely on assumptions about the distribution of data, such as normality and linearity. They are used when data meets certain criteria and allows for more powerful tests.

Signup and view all the flashcards

What are Non-Parametric Statistics?

Non-parametric statistics are used when data does not meet the assumptions of normality or linearity required for parametric tests. They are more flexible but generally have less power.

Signup and view all the flashcards

What is Correlation?

Correlation measures the strength and direction of the linear relationship between two variables. A positive correlation indicates that both variables move in the same direction, while a negative correlation means they move in opposite directions.

Signup and view all the flashcards

What is a Correlation Coefficient?

A correlation coefficient is a numerical value that quantifies the strength and direction of a correlation. Values range from -1 to +1, with 0 indicating no correlation. A value of 1 indicates a perfect positive correlation, and -1 indicates a perfect negative correlation.

Signup and view all the flashcards

What is a Scatter Plot?

A scatter plot is a graphical representation that shows the relationship between paired data points. It helps to visually assess the strength and direction of a correlation.

Signup and view all the flashcards

What is Pearson's r?

Pearson's r is a parametric correlation coefficient used to measure linear association between two continuous variables. Its assumptions include normality, linearity, and no outliers.

Signup and view all the flashcards

What is a T-test?

A t-test is a statistical test used to compare the means of two groups. It determines whether there is a statistically significant difference between the group means.

Signup and view all the flashcards

What are Outliers?

Outliers are data points that are significantly different from other data points in a dataset. They can influence the results of parametric analyses, so it's important to identify and address them.

Signup and view all the flashcards

What is a Trend Line?

A trend line is a line on a scatter plot that shows the general direction of the relationship between two variables. It helps to visualize the correlation between the variables.

Signup and view all the flashcards

What is Causation?

Causation refers to a cause-and-effect relationship between two variables, where one variable directly influences the other. Correlation does not imply causation. Just because two variables are correlated does not mean that one causes the other.

Signup and view all the flashcards

What is an Intervention?

An intervention is a planned set of actions or treatments implemented to change a specific outcome or behavior. It can be used to test the effectiveness of a new treatment or intervention.

Signup and view all the flashcards

What is a Normal Distribution?

Normal distribution is a bell-shaped distribution that represents the distribution of many natural phenomena. It occurs when data is symmetrically distributed around the mean.

Signup and view all the flashcards

What is Linearity?

Linearity refers to a straight-line relationship between two variables. Data is linear when the relationship between variables can be represented by a straight line.

Signup and view all the flashcards

Study Notes

Quantitative Research SoHP503 Project Studies

  • The presentation is given by Dr. Krithika Anil, a Research Fellow at the University of Plymouth.
  • The course code is SOHP503, and it's about quantitative research.

Virtual Meeting Etiquette

  • Turn off your phone.
  • Leave the keyboard alone unless using it for chat or activity.
  • Dress appropriately (no pajamas).
  • Be mindful of your surroundings (no messy rooms, inappropriate posters/backgrounds).
  • Mute your microphone when not talking.
  • Speak up, and stay seated and present. Position camera to show full head, not just forehead, chest or room.

What is this lecture about?

  • Students have collected quantitative data, and the lecture outlines the next steps.
  • Learning objectives include understanding and applying descriptive statistical techniques to data, presenting the data correctly, acquiring and applying inferential statistical techniques, and critically assessing statistically appropriate techniques applicable to the research aim.

What makes numbers important?

  • Numerical scores (e.g., 5/5, 5/10, 5/100) are used in various contexts and show important information.
  • Examples presented include student scores (and their percentage relation), with the highest marks for the given scores given.
  • Pain score data is presented as an example showing how numbers can show a context like pain.
  • Numbers allow for the report of numerical context and illustrate analysis, showing various numerical contexts.

Data type

  • Data can be numerical (e.g., height, number of patients, walking speed, assessment score)
  • Data can be ordinal (e.g., rankings, satisfaction rating, spice tolerance)
  • Data can be nominal (e.g., preferences, nationality, hair colour)

Descriptive statistics

  • Describes the collected data.
  • Analysis techniques include frequency, central tendency (mean, median, mode), distribution, and mean difference.

Descriptive statistics – Frequency

  • A frequency table is a way to show how often each value appears for a categorical variable.
  • Example used likeliness to watch horror films and eye colour.

Descriptive statistics - Frequency (Cross-tab)

  • A cross-tab frequency table is given to explain cross-tabulated data.
  • An example presents likeliness to watch horror and eye colour, showing that different percentages of people of different eye colours had different levels of likeliness to watch horror.
  • Bar charts are also given as alternative data display. Use of tables and graphs is suggested in the case of too many variables.

Descriptive statistics - Frequency (Two numerical variables)

  • Example relating height and age shows frequency tables and scatter plots, with the scatter plot being a better visual for the data since it is easier to understand.
  • Example presents data with relation to height, age and different eye colours, in a scatterplot graph.

Descriptive statistics - Central tendency

  • Describes the centre point of a dataset.
  • Techniques include mean (sum of values divided by total values), median (middle value in ascending order), and mode (most frequent value).
  • Example data is presented in relation to mean, median and mode calculations.

Descriptive statistics - Distribution

  • Shows the spread and patterns in the data.
  • Includes normal distribution (symmetrical shape), skewed distribution (asymmetrical shape showing whether data is more spread out on one side than the other).
  • Methods include histograms, normal / skewed data plots and boxplots along with spread of data descriptions.

Descriptive statistics - Distribution (Standard deviation)

  • Standard deviation (SD) shows the spread of data around the mean.
  • The further data points are from the mean, the higher the SD, showing that the data is more spread out.
  • Examples related to the spread of data are presented
  • Examples for standard deviation and normal distribution is given.

Descriptive statistics - Distribution (Different types)

  • Data can be normal distribution, or skewed.
  • Example presentations of small vs large spread of data showing how the graphs look

Descriptive statistics - Distribution (IQR)

  • SD isn't always the best for skewed distributions.
  • IQR (interquartile range) is better for identifying spread in middle half of data.
  • Median and Q1 and Q3 values are given to illustrate skewed distribution and calculation thereof as an alternative to standard deviation.

Descriptive statistics - Mean difference

  • Compares the means of two groups.
  • Helps determine the effect size.
  • Example of how comparing two different groups / populations is able to give a mean difference.

Inferential statistics

  • Makes assumptions/ inferences about population using sample data.
  • Techniques include correlation, T-test, and ANOVA.

Inferential statistics - Sample Size

  • Importance of sample sizes in inferential statistics
  • It is important that sample size is large enough for making appropriate inferences and creating reliable results.
  • Example of how small sample size can affect results

Inferential statistics - P-value

  • Indicates the likelihood of an outcome happening by chance.
  • Helps assess whether difference between groups is significant (e.g., by rejecting the null hypothesis)
  • A p-value does not mean that the research hypothesis is valid.

Inferential statistics - Parametric and Non-Parametric variables

  • Parametric tests rely on data meeting certain assumptions (e.g., normally distributed, linear).
  • Non-parametric tests do not have as many assumptions, but may need larger samples

Inferential statistics - Correlation

  • Shows extent to which variables move together (positive, negative, or no correlation).
  • Illustrates that correlation does not mean causation; A change in one variable does not necessarily cause the change in the other variable.

Inferential statistics - Correlation (Scatter Plots and Pearson's r)

  • Scatter plots are graphs helpful for seeing correlations.
  • Pearson's correlation coefficient shows the strength and direction of the relationship, with values between -1 and 1.

Inferential statistics - T-test

  • Compares means of two groups.

Inferential statistics - ANOVA

  • Compares means of more than two groups.
  • Types of ANOVAs are also discussed in relations to single or multiple variables.

Activity - Practical Example (Type 2 Diabetes Intervention Using a Mobile App)

  • This relates a description of practical example of the use of Quantitative research.
  • Includes the objective, methods, and results of the study.

Studying That Suits You

Use AI to generate personalized quizzes and flashcards to suit your learning preferences.

Quiz Team

Related Documents

More Like This

Use Quizgecko on...
Browser
Browser