For each of the following studies, say whether you would use a t-test for indepe

Question

For each of the following studies, say whether you would use a t-test for independent means or for dependent means.

-An educational researcher randomly assigns a group of 47 fourth-grade students to receive a new after-school math program and 48 other fourth-grade students to receive the standard after-school math program, and then measures how well they all do on a math test.

-A marketing researcher measures 100 doctors’ reports of the number of their patients asking them about a particular drug during the month before and the month after a major advertising campaign.

-A researcher tests the reaction time of a group of 14 individuals twice, once while in a very hot room and once while in a normal-temperature room.

-A researcher measures the heights of 40 college students who are the firstborn in their families and compares the 15 who come from a large family to the 25 who come from smaller families.

-A researcher tests performance on a math skills test of each of 250 individuals before and after they complete a one-day seminar on managing test anxiety.

-A researcher compares the resting heart rate of 15 individuals who have been taking a particular drug to the resting heart rate of 48 individuals who have not been taking this drug.

Explanation / Answer

1. An educational researcher: t-test for independent means.

2. A marketing researcher: t-test for dependent means

3. A researcher tests the reaction time: t-test for dependent means

4. A researcher measures the heights: t-test for independent means

5. A researcher tests performance on a math skills: t-test for dependent means

6. A researcher compares the resting heart rate: t-test for independent means

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