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Unformatted text preview: TARLETON STATE UNIVERSITY Chapter 8Homework Problems: Emmert.S [Pick the date] 1) A doctor is interested in determining whether a film about exercise will change 10 persons attitudes about exercise. The results of his questionnaire are shown. A higher numerical value shows a more favorable attitude toward exercise. Is there enough evidence to support the claim, at alpha= 0.05, that there was a change in attitude? (Complete the Proper Box for this study): Paired Design Hypothesis: Test statistic= PValue= Decision and conclusion: Independent Design a. Conduct an F test of variances to determine whether to use a pooled ttest or nonpooled ttest: Test statistic F (3 decimal places) =_______ Pvalue (4 decimal places) =________ Conclusion (select one): ____There is evidence that the variances are different. ____ No evidence that the variances are different. b. Based on your Ftest of variances which test of means will be conducted? (Select one) ____a pooled ttest ____ nonpooled ttest. c. Conduct the proper ttest selected above. Hypothesis: Test statistic= PValue= Decision and conclusion: 2) A researcher wanted to compare the pulse rates of identical twins to see whether there was any difference. Eight sets of twins were selected. The rates are given in the table as number of beats per minute. At alpha=0.01, is there a significant difference in the average pulse rates of twins? (Complete the Proper Box for this study): Paired Design Hypothesis: Test statistic= PValue= Decision and conclusion: Independent Design d. Conduct an F test of variances to determine whether to use a pooled ttest or nonpooled ttest: Test statistic F (3 decimal places) =_______ Pvalue (4 decimal places) =________ Conclusion (select one): ____There is evidence that the variances are different. ____There is evidence that the variances are different....
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 Summer '11
 KeithEmmert

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