Question 1

A researcher wants to examine whether there is a significant difference in blood pressure before and after a new medication in the same group of patients. Which statistical test is most appropriate for this scenario?

Accepted Answer

Dependent T-test

Question 2

Which of the following is the correct formula for a simple linear regression model?

Accepted Answer

$$y = a + bx$$

Question 3

A hospital administrator wants to know if there is an association between gender (male/female) and whether patients develop diabetes (yes/no). Which statistical test should be used?

Accepted Answer

Chi-Square Test of Independence

Question 4

Which of the following statements about Pearson's correlation coefficient $$r is $$TRUE?

Accepted Answer

$$r$$ measures the strength and direction of a linear relationship between two variables

Question 5

A study compares the mean test scores of three different teaching methods among independent groups of students. Which statistical test is most appropriate?

Accepted Answer

One-way ANOVA

Question 6

Which regression model is most appropriate when the dependent variable is binary (e.g., success/failure)?

Accepted Answer

Logistic Regression

Question 7

A researcher wants to test if there is a relationship between the number of hours studied (continuous) and exam score (continuous). Which statistical method should be used?

Accepted Answer

Pearson's correlation

Question 8

Which of the following is a key assumption of the independent T-test?

Accepted Answer

The two groups are independent and the dependent variable is interval or ratio

Question 9

A study measures cholesterol levels in patients before and after a diet intervention. Which test would best determine if the diet had a significant effect?

Accepted Answer

Dependent T-test

Question 10

Which of the following best describes the purpose of multiple regression analysis?

Accepted Answer

To predict the value of a dependent variable based on two or more independent variables

Question 11

A researcher is interested in the relationship between students' class rank (ordinal) and their satisfaction with school (ordinal). Which correlation coefficient should be used?

Accepted Answer

Spearman's rho

Question 12

Which of the following is NOT a requirement for using the Chi-Square Test of Independence?

Accepted Answer

The variables are measured at the interval or ratio level

Question 13

A clinical trial compares the effectiveness of four different drugs on reducing blood pressure. Which statistical test should be used to compare the mean reduction across the four groups?

Accepted Answer

One-way ANOVA

Question 14

Which of the following scenarios would require the use of the McNemar test?

Accepted Answer

Testing changes in a binary outcome (e.g., yes/no) in the same subjects before and after an intervention

Question 15

Which of the following best describes the relationship between the standard error and the precision of a regression model?

Accepted Answer

A lower standard error indicates a more precise model

Question 16

A researcher wants to determine if there is a difference in the proportion of smokers between two independent groups (e.g., males and females). Which test is most appropriate?

Accepted Answer

Chi-Square Test of Independence

Question 17

Which of the following is the correct formula for multiple linear regression?

Accepted Answer

$$y = a + b_1x_1 + b_2x_2 + \ldots + b_rx_r$$

Question 18

A study measures the relationship between the number of hours of exercise per week (interval) and cholesterol level (ratio) in adults. Which statistical test is most appropriate?

Accepted Answer

Pearson's correlation

Question 19

Which of the following is a key difference between ANOVA and the independent T-test?

Accepted Answer

ANOVA compares means across more than two groups, while the independent T-test compares means between two groups

Question 20

A researcher wants to test if there is a significant association between marital status (married/single) and preference for a new product (like/dislike). Which test should be used?

Accepted Answer

Chi-Square Test of Independence

Statistical Tests, Regression, and Correlation: Study Guide

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