Questions and Answers
What type of sample is defined as a convenience sample?
Which sampling method is described when the hotel uses a random number generator to select guests for surveys?
What sampling method does the hotel manager use when giving a survey to every 10th person checking out?
Calculate the mean for the following scores: 12, 13, 14, 18, 19, 20.
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Calculate the median for the following set of scores: 4, 32, 25, 1, 13, 30, 3.
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What is the mode for the following set of scores: 11, 11, 12, 13, 13, 14, 14, 14, 15, 15, 16, 18, 18?
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Calculate the range for the following set of scores: 19, 15, 2, 17, 23, 7.
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If you see the notation $\Sigma X$^2, what should you do?
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Calculate the interquartile range (IQR) using the following five-number summary: Max = 40, Q3 = 30, Median = 20, Q1 = 10, Min = 5.
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If the variance is 400, what is the standard deviation?
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Using the following data, calculate the upper fence for a boxplot. IQR = 40, Q3 = 70.
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Using the following data, calculate the lower fence for a boxplot. IQR = 22, Q1 = 45.
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Which of the following is NOT one of the conditions to check before calculating your correlation?
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There is a high correlation between babies listening to Mozart and their intelligence. What conclusion can be drawn based on this correlation?
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What level of measurement is temperature measured on the Celsius scale?
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What level of measurement is worker occupation (e.g., professional, white collar, blue collar)?
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What level of measurement is speed measured on miles/hour?
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What level of measurement are the top 10 movies in 2018?
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What type of data are monthly profits earned by Samsung for the year 2016?
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What type of data is the mean selling price for homes in Auburn and Opelika last month?
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What type of data is generated from the survey question asking about favorite types of music?
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What type of data is generated from the survey question asking how many music downloads you purchased last year?
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What type of data is indicated when asking for your age (in years)?
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What type of data is indicated when asking how many people live in your household?
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What is the frequency for the number of times a student received a 'B' in a course?
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What is the relative frequency for a 'B' grade from the given frequency table?
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What is the relative percentage for an 'A' grade based on the frequency table?
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Which of the following describes the bar chart showing major frequencies?
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What statement is true regarding gender and year of internship as per the segmented bar chart?
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What is the row percentage for Females with a starting salary of 39 or less from the contingency table?
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What is the column percentage for Males with a starting salary of 39 or less?
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What is the total percentage for Females with a starting salary of 40 - 45?
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In a contingency table, when the distribution of one variable is the same for all categories of another variable, we say that the variables are ________________.
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What is true about the pie chart regarding students' grades?
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Which correlation shows the weakest relationship between two variables?
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Which correlation shows the strongest relationship between two variables?
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Looking at this scatterplot, the correlation is of ____________ direction.
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Which of the following is NOT one of the conditions to check before calculating your correlation?
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Looking at this scatterplot, the correlation is of ____________ direction.
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Looking at this scatterplot, its form is ____________.
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Calculate the correlation using the following data: n = 3, ∑ X = 15, ∑ X^2 = 83, ∑ Y = 18, ∑ Y^2 = 116, sum XY=94.
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Which conclusion is true regarding the correlation between the crime rate and the number of people eating at restaurants?
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Calculate the correlation using the following data: ∑ ( X − X¯ )( Y − Y¯) = 19, ∑ ( X − X¯)2 = 14, ∑ ( Y − Y¯)2 = 28.33.
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When making a scatterplot with two variables and 20 cases, how many points will be on the plot?
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What is the intercept of the regression line from the given data: Salary=48556+1550 Years of Experience (X)?
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What is the slope of the regression line given: Time on Market^=−0.73+.024 Asking Price ( X )?
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If you have a correlation = 0.50, what is the value of R^2?
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Calculate the slope of the regression line using given data: X = 10.76, Y = 15.39, sx = 3.54, sy = 5.87, r = -0.48.
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Calculate the intercept of the regression line using given data: X = 6.46, Y = 10.74, sx = 4.79, sy = 4.19, b1 = 1.21.
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If given the regression equation y^ = 15.84−0.1279 X and provided with a new value for X = 45, what is your predicted score on y?
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If your actual y-value is 10 and the predicted y-value is 12, what would be your residual?
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Which of the following is NOT a name for our regression line?
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Which of the following is NOT a condition to check before conducting regression analysis?
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Using the following data, what would be your predicted z y^ if r = 0.50 and zx = 3?
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What is the name of the phenomenon where people believe that an outcome of a random event that hasn't occurred is 'due' to occur?
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What is the probability of the outcome of Stage 1 occurring based on the given stage outcomes?
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Which of the following values is NOT possible for a probability?
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What must the probability for Outcome 5 be in order to ensure the entire sample space is represented?
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What is the P(A and B) if P(A) = 0.70 and P(B) = 0.30 with A and B being independent?
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What is the P(A or B) if P(A) = 0.45 and P(B) = 0.25 with A and B being disjoint?
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What is the P(A or B) if P(A) = 0.35, P(B) = 0.55, and P(A and B) = 0.15?
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What is the probability of getting heads on each of the three coins tossed at the same time?
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Would it be mutually exclusive to select a red card and an ace from a standard deck?
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What is the P(neither A or B) if P(A) = 0.25, P(B) = 0.15, and P(A and B) = 0.10?
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What is P(Male | Use) if the given contingency table indicates seat belt use?
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What is P(Male) if the given contingency table indicates seat belt use?
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Are Gender and Seat Belt Use Independent according to the given contingency table?
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Is the scenario where a firm realizes about 15% of its packages are not sealed properly a Bernoulli trial?
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If 91% of students surveyed at a university opened a new credit card account in the past year, how many would you expect to survey before finding one who had not?
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Is the cheating admission data among MBA students a Bernoulli trial?
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What is the probability that a committee of 3 people consists only of Republicans selected from a council of 6 Republicans and 14 Democrats?
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Is the scenario of a website manager noticing the rate of checkouts a Bernoulli trial?
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What is the probability that 2 out of the next 20 calls placed on a cell phone will be dropped, where the probability of a dropped call is 0.02?
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What is the probability that the appliance repair shop receives 5 calls in a given hour with an average of 2 repair calls?
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What is the probability that a traveler is sent to Station 2 if there are 22 equally likely stations?
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What is the probability of the first left-handed person being the tenth person chosen from a randomly selected sample of 10 customers?
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What is the probability that an inspector finds no button flaws examining 46 shirts with 6 buttons each, knowing the flaw rate is 0.001?
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What percent of values fall within ± 2 standard deviations of the mean in a unimodal, symmetric distribution?
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How would you represent population mean 100 and standard deviation 10 with a normal model?
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Calculate the z-score given: μ = 200, σ = 30, X = 245.
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What is the number found in the z-table for z-score -2.42 regarding the area under the curve from the z-score and below?
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What is the number found in the z-table for z-score 1.56 regarding the area under the curve from the z-score and below?
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Given the following parameters, calculate P(X ≤ 425): μ = 500, σ = 100.
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Given parameters μ = 160, σ = 16, what is P(X ≥ 186)?
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Given μ = 200, σ = 20, what is P(184 ≤ X ≤ 212)?
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Find the z-score for the top 9% of scores. Given data: μ = 100, σ = 10.
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The mean of the standard normal distribution is always __________.
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What is np if n = 95 and p = 0.20?
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What is nq if n = 95 and q = 0.80?
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Does this study meet the success/failure condition if n = 95 and p = 0.20?
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If p = 0.44, what is q?
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What is p-hat if you surveyed 1700 people and 1275 completed the survey?
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What is your critical value (z*) for calculating a 90% confidence interval?
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As the sample size increases, what happens to the standard error of p-hat?
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Calculate the standard error of p-hat given n = 95 and p = 0.20.
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Which statement correctly describes results using a confidence interval?
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Which of the following is not an assumption required for constructing a confidence interval for the proportion?
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What level of measurement is the year you were born?
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What level of measurement is your Medical Insurance Policy Number?
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What level of measurement is income earned this week at your job?
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Study Notes
Levels of Measurement
- Temperature on the Celsius scale is classified as Interval measurement.
- Worker occupations (professional, white collar, blue collar) are classified as Nominal measurement.
- Speed measured in miles/hour is classified as Ratio measurement.
- Rankings of the top 10 movies in 2018 represent Ordinal measurement.
Data Types
- Time-Series Data consists of monthly profits earned by Samsung in 2016.
- Cross-Sectional Data refers to mean selling prices for homes in Auburn and Opelika last month.
Types of Data from Surveys
- Questions about favorite music genres yield Categorical Data.
- Questions about the number of music downloads purchased last year also yield Categorical Data.
- Asking for a participant's age generates Quantitative Data.
- Inquiring about household size generates Quantitative Data as well.
Frequency and Relative Frequency
- Frequency of "B" grades recorded is 11 for 20 courses taken.
- The relative frequency for a "B" grade from a table with 30 total grades is 0.5.
- Relative percentage for an "A" grade from a table with 40 total grades is 45.
Analysis of Charts and Gender Studies
- A bar chart illustrates that each major has approximately the same frequency.
- A segmented bar chart indicates that a greater percentage of female students go on internships in their senior year compared to male students.
Contingency Tables and Percentages
- In contingency tables, the row percentage for females with starting salaries of 39 or less is 0.10.
- The column percentage for males with starting salaries of 39 or less is 0.625.
- Total percentage for females with starting salaries of 40 - 45 is 0.42.
Correlation and Scatterplots
- A positive correlation suggests the relationship moves in the same direction.
- A negative correlation indicates the relationship moves in opposite directions.
- Curvilinear relationships in scatterplots display non-linear patterns.
- Weakest correlation listed is 0.11, while the strongest is -0.89.
Regression Analysis
- The intercept of a regression line of Salary = 48556 + 1550*Years of Experience is 48556.
- The slope of the regression line of Time on Market = -0.73 + 0.024*Asking Price is 0.024.
- Correlation squared (R²) for a correlation of 0.50 is 0.25.
Probability
- Events are independent if the outcome of one does not affect the other.
- The probability of a dropped call equaling 0.02 implies a Binomial model for predicting occurrences.
- A Bernoulli trial is defined by a fixed number of independent trials with two possible outcomes.
Confidence Intervals
- A correct description of results using a confidence interval includes the phrase "We are 95% confident..."
- The critical value for a 90% confidence interval is 1.645.
- As sample size increases, Standard Error (SE) of p-hat decreases.
Descriptive Statistics
- Calculate the mean from the scores 12, 13, 14, 18, 19, 20 yields 16.
- The median from the set 4, 32, 25, 1, 13, 30, 3 is 13.
- The mode from the scores 11, 11, 12, 13, 13, 14, 14, 14, 15, 15, 16, 18, 18 is 14.
- The range of scores 19, 15, 2, 17, 23, 7 is 21.
- Interquartile range (IQR) calculated from max 40, Q3 30, median 20, Q1 10, min 5 is 20.
Variance and Standard Deviation
- If the variance is 400, the corresponding standard deviation is 20.
Studying That Suits You
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Description
Test your knowledge on the levels of measurement in statistics with this quiz. Covering interval, nominal, ratio, and ordinal types, each flashcard challenges your understanding of how different data can be categorized. Perfect for review before your final exam.