10 Researchers Conducted An Experiment To Test The Effects Of Alcohol The Errors Were Recorded In A Test Of Visual And 1 (45.7 KiB) Viewed 43 times
10 Researchers Conducted An Experiment To Test The Effects Of Alcohol The Errors Were Recorded In A Test Of Visual And 2 (47.55 KiB) Viewed 43 times
10) Researchers conducted an experiment to test the effects of alcohol. The errors were recorded in a test of visual and motor skills for a treatment group of 31 people who drank alcohol and another group of 31 people who drank a placebo liquid. The errors for the treatment group had standard deviation 2.37, while the errors for the placebo group had standard deviation 0.85. Use a 0.05 significance level to test the claim that the treatment group had errors with higher standard deviation than did the placebo group. Which group should be group 1? a) Neither one b) Either one 11) See problem 10. State the null and alternative Ho: Ho: a₁ = 0₂ a): > Ha: 0₁ 0₂ 0₂ b) b) 2.0739 13) See problem 10. Calculate the test statistic. a) 1.1397 b) 7.7742 c) Placebo group 12) See problem 10. Use Table A-5 to find the critical value. a) 2.0923) 14) See problem 10. Calculate the pvalue. a) 1.1396 b) 1.1397 hypotheses. Ho: 0₁ 0₂ c) Ha: ₁ = 0₂ c) 1.6928 c) 2.4895 c) 7.7718 d) Treatment group Ho:0₁ 20₂ d) Ha: ₂ <₂ d) 1.8409 d) 7.7743 d) 1.1397x10-7 15) See problem 10. State the technical conclusion based on the traditional method. a) The test statistic is less than the critical value; Reject Ho. b) The test statistic is greater than the critical value; Reject Ho. c) The test statistic is less than the critical value; FTR Ho. d) The test statistic is greater than the critical value; FTR Ho.
16) See problem 10. State the technical conclusion based on the pvalue method. a) The pvalue is less than alpha; Reject Ho. b) The pvalue is less than alpha; FTR Ho. c) The pvalue is greater than alpha; Reject Ho. d) The pvalue is greater than alpha; FTR Ho. 17) See problem 10. State the non-technical conclusion. a) There is sufficient evidence to warrant rejection of the claim that the treatment group had errors with higher standard deviation than did the placebo group. b) There is not sufficient evidence to warrant rejection of the claim that the treatment group had errors with higher standard deviation than did the placebo group. c) The sample data support the claim that the treatment group had errors with higher standard deviation than did the placebo group. d) There is not sufficient sample evidence to support the claim that the treatment group had errors with higher standard deviation than did the placebo group. 18) See problems 10-17. Choose the most true comment.. a) We showed that those drinking alcohol made more errors than those drinking the placebo liquid. b) We failed to show anything conclusive. c) We showed that those drinking alcohol made an equivalent number of errors as those drinking the placebo liquid. d) We showed that those drinking alcohol had a greater standard deviation (meaning more variation among participants) than those drinking the placebo group.
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