Question

5.17 Paired or not, Part I?: In each of the following scenarios, determine if the data are paired.

(a) Compare a student's pre-test (beginning of semester) and post-test (end of semester) score.

• paired

• not paired

(b) Assess gender-related salary gap by comparing salaries of randomly sampled men and women.

• paired

• not paired

(c) For each patient, compare artery thicknesses at the beginning of a study and after 2 years of taking Vitamin E.

• not paired

• paired

(d) Assess effectiveness of a diet regimen by comparing the before and after weights of subjects.

• paired

• not paired

Answer 1

a) it's a paired t test because we are comparing score for a same student even before and after the semester beginning.

b) not paired because men and women are differ by gender there is no relationship between their salaries.

c) it's a paired because we are comparing a patients artery thickness before and after the treatment.

d) it's a paired because the same persons weight is being checking before and after the diet.