Twenty-two women are sent a "self confidence" questionnaire and an offer to receive a free beauty and fashion makeover. All 22 women accept and show up with their completed questionnaires. One week after the makeover, the women are again asked to fill out the "self confidence" questionnaire. What test would you use to see if the makeover significantly changes their confidence rating?
a. z-test for a proportion
b. t-test for a single mean
c. t-test for the difference between two independent means
d. z-test for the difference between two independent means
e. t-test for the difference between dependent means
Ans: e
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