In Exercise 8.66, we examined the results of a 2001 study

Chapter 10, Problem 22E

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In Exercise 8.66, we examined the results of a 2001 study by Leonard, Speziale and Pernick comparing traditional and activity-oriented methods for teaching biology. Pretests were given to students who were subsequently taught by one of the two methods. Summary statistics were given for the pretest scores for 368 students who were subsequently taught using the traditional method and 372 who were taught using the activity-oriented method.

a  Without looking at the data, would you expect there to be a difference in the mean pretest scores for those subsequently taught using the different methods? Based on your conjecture, what alternative hypothesis would you choose to test versus the null hypothesis that there is no difference in the mean pretest scores for the two groups?

b  Does the alternative hypothesis that you posed in part (a) correspond to a one-tailed or a two-tailed statistical test?

c  The mean and standard deviation of the pretest scores for those subsequently taught using the traditional method were  and , respectively. For those subsequently taught using the activity-oriented method, the respective corresponding mean and standard deviation were  and  Do the data provide support for the conjecture that the mean pretest scores do not differ for students subsequently taught using the two methods? Test using \(\alpha=.01\)

Equation Transcription:

Text Transcription:

\alpha=.01

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