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What test of signifi cance would you use to analyze data from the following studies? a

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What test of signifi cance would you use to analyze data from the following studies?

a. You want to determine the effectiveness of three different methods of teaching spelling on third-graders’ achievement in spelling. Students are randomly assigned to one of the three methods.

b. Many high school students work part-time during the school term. You want to know if the part-time work has an adverse effect on these students’ academic performance. You draw a sample of students who work and ask them the number of hours they worked per week during the academic year; you use grade point average as a measure of their academic performance.

c. You want to compare the popularity of three different brands of jeans among high school girls. You draw a random sample of high school girls and ask them their preference.

d. You want to compare the effectiveness of a fi lm on global warming on the attitudes of college students toward environmental issues. You randomly select two groups of college students currently enrolled in introductory psychology. You show your fi lm to one group and an interesting but unrelated fi lm to the other group. Following the fi lm, you compare the two groups on a measure of attitudes toward environmental issues