Question 1127358: We have conducted a weight loss intervention using 40 volunteers and have measured waist circumference before the intervention and after the intervention. Which type of analysis is more appropriate?
A. Independent samples z-test
B. Independent samples t-test
C. Matched samples t-test
D. Matched samples z-test
Answer by MathLover1(20850)   (Show Source):
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The paired sample t-test, sometimes called the dependent sample t-test, is a statistical procedure used to determine whether the mean difference between two sets of observations is zero. In a paired sample t-test, each subject or entity is measured twice, resulting in pairs of observations. Common applications of the paired sample t-test include case-control studies or repeated-measures designs. Suppose you are interested in evaluating the effectiveness of a company training program. One approach you might consider would be to measure the performance of a sample of employees before and after completing the program, and analyze the differences using a paired sample t-test.
answer: C. Matched samples t-test
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