Stats: Descriptives and Normal Distribution

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What is the primary assumption of the Central Limit Theorem?

The sample size is less than 30

The population's distribution is normally distributed

The data is nominal

The sampling distribution of the sample mean is approximately normally distributed (correct)

What descriptive statistics are used for ordinal data?

Median and range (correct)

Mode and range

Mean and range

Median and standard deviation

What is the purpose of descriptive statistics in simple experimental designs?

To summarise the data from each sample (correct)

To test the significance of the results

To compare the two groups

To calculate the correlation coefficient

What is illustrated by a scattergram and regression line?

The correlation between two variables (B) Signup and view all the answers

What is the level of measurement required for using mean and standard deviation?

Interval and ratio (C) Signup and view all the answers

What is the purpose of testing the assumption of normality?

To ensure the use of certain statistical tests (C) Signup and view all the answers

What is the main application of the Central Limit Theorem in psychological research?

Inferential statistics in diverse populations (C) Signup and view all the answers

What is the primary purpose of descriptive statistics in research?

To summarise and describe data (A) Signup and view all the answers

What is the primary distinction between descriptive and inferential statistics?

Descriptive statistics summarises data, while inferential statistics makes inferences (C) Signup and view all the answers

What is the purpose of testing the assumption of normality in statistical analysis?

To ensure the validity of parametric tests (D) Signup and view all the answers

What is the primary role of hypothesis testing in psychological research?

To advance scientific knowledge and validate findings (D) Signup and view all the answers

What is the primary advantage of using random sampling methods in research?

To increase the generalisability of the findings (A) Signup and view all the answers

What is a primary objective of performing tests for normality?

To validate the use of parametric statistical methods (A) Signup and view all the answers

What is the primary difference between descriptive and inferential statistics?

Descriptive statistics summarizes data, while inferential statistics makes conclusions about a population (C) Signup and view all the answers

What is the purpose of a paired t-test?

To compare the means of two related groups (B) Signup and view all the answers

What is a requirement for using parametric inferential tests of difference?

The data must be normally distributed (C) Signup and view all the answers

What is the purpose of a Wilcoxon signed rank test?

To compare the means of two related groups without assuming normality (B) Signup and view all the answers

What is the primary advantage of using inferential statistics?

It enables us to make conclusions about a population based on a sample (B) Signup and view all the answers