Which of the following requires a dependent sample t-test? - A clinical study investigating a new drug’s effect lowering cholesterol using two different groups of participants, one control group and the other experimental group - A study comparing academic achievement of a group of students who receive a learning intervention versus those who do not. - A study comparing academic achievement of a group of students before and after a learning intervention. - A study comparing life satisfaction between individuals who work versus who stay at home.

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A:

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Q: Individual Purchase Rating After Before 1 6 5 2 6 5 3 7 7 4 4 3 5 3 6 6 9 8 7 7 5 8 6 7

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A: To testH0:μ1=μ2=μ3H1:μ1≠μ2≠μ3