lecture 4 mcqs

Question 1

1. A study records the test anxiety scores of students before and after attending a mindfulness workshop. The scores are continuous and normally distributed. What is the appropriate test?

A) Unpaired t-test
B) Chi-square test
C) Paired t-test
D) ANOVA

Answer 1

C

Question 2

2. A study compares cholesterol levels between vegetarians and non-vegetarians. Cholesterol is normally distributed. What test should be used?
   A) Wilcoxon rank-sum test
   B) Paired t-test
   C) Independent (unpaired) t-test
   D) McNemar’s test

Answer 2

C

Question 3

3. You’re comparing weekly alcohol intake (non-normal distribution) between athletes and non-athletes. What test should be used?
   A) Paired t-test
   B) Independent t-test
   C) Wilcoxon rank-sum (Mann-Whitney U) test
   D) ANOVA

Answer 3

C

Question 4

4. A group of asthma patients is assessed at baseline, 1 month, and 3 months for lung function. What test should be used to compare the three time points?
   A) One-way ANOVA
   B) Independent t-test
   C) Repeated-measures ANOVA
   D) Chi-square test

Answer 4

C

Question 5

5. Which of the following is an assumption of one-way ANOVA?
   A) Paired data
   B) Equal variances across groups
   C) Outcome is binary
   D) Non-normality of data

Answer 5

B

Question 6

6. If you’re comparing depression scores across three different therapy groups, and scores are not normally distributed, what test is most appropriate?
   A) One-way ANOVA
   B) Chi-square test
   C) Kruskal-Wallis test
   D) Paired t-test

Answer 6

C

Question 7

7. A school evaluates math scores before and after using a new teaching app. The sample is small, and data is not normally distributed. What test is appropriate?
   A) Independent t-test
   B) Paired t-test
   C) Wilcoxon signed-rank test
   D) Kruskal-Wallis test

Answer 7

C

Question 8

8. A researcher compares four diet plans for weight loss. Data is normal and continuous. What test should be used?
   A) Chi-square test
   B) One-way ANOVA
   C) Wilcoxon signed-rank test
   D) McNemar’s test

Answer 8

B

Question 9

9. A significant ANOVA result (p < 0.05) tells you:
   A) All group means are the same
   B) All groups differ from each other
   C) At least one group differs from another
   D) The median values are significantly different

Answer 9

C

Question 10

10. What is the purpose of Bonferroni correction in multiple comparisons?
    A) Increase power
    B) Adjust for non-normality
    C) Reduce Type I error
    D) Handle correlated data

Answer 10

c

Question 11

11. You’re testing the effect of two moisturisers (left vs right hand) in the same person. Outcome: presence of rash (yes/no). What test is correct?
    A) Chi-square test
    B) Fisher’s exact test
    C) McNemar’s test
    D) Independent t-test

Answer 11

C

Question 12

12. When comparing the percentage of males and females who own pets, which test is most appropriate?
    A) Chi-square test
    B) Paired t-test
    C) ANOVA
    D) Kruskal-Wallis test

Answer 12

A

Question 13

13. Which situation violates the assumptions of a paired t-test?
    A) Measuring blood pressure before and after treatment
    B) Comparing twins’ heights
    C) Comparing unrelated participants’ test scores
    D) Measuring glucose levels at two time points

Answer 13

C

Question 14

14. A study looks at the proportion of students who passed a test under three different study methods. What test should you use?
    A) One-way ANOVA
    B) Kruskal-Wallis test
    C) Chi-square test
    D) Paired t-test

Answer 14

C

Question 15

15. In a trial with non-normally distributed satisfaction scores (Likert scale), you want to compare two independent groups. What test is best?
    A) Independent t-test
    B) Wilcoxon rank-sum test
    C) Paired t-test
    D) McNemar’s test

Answer 15

B

Question 16

16. Which test compares medians across two independent groups when data is skewed?
    A) One-way ANOVA
    B) Paired t-test
    C) Wilcoxon rank-sum test
    D) Fisher’s exact test

Answer 16

C

Question 17

17. A study compares pain levels (on a 0–10 scale, not normally distributed) between three groups. What is the best choice of test?
    A) One-way ANOVA
    B) Kruskal-Wallis test
    C) Wilcoxon signed-rank test
    D) McNemar’s test

Answer 17

B

Question 18

18. You record presence/absence of acne on the left vs right cheek after two different creams are applied. What test is suitable?
    A) Chi-square test
    B) McNemar’s test
    C) Independent t-test
    D) Kruskal-Wallis test

Answer 18

B

Question 19

19. When using ANOVA, how do you determine which specific groups differ?
    A) Chi-square test
    B) Post-hoc tests (e.g., Bonferroni correction)
    C) Regression
    D) p-value from F-test

Answer 19

B

Question 20

20. You wish to compare heights (continuous, normally distributed) among five ethnic groups. What test should you use?
    A) Paired t-test
    B) Kruskal-Wallis test
    C) One-way ANOVA
    D) Chi-square test

Answer 20

C