# RES 341 Final Exam with Instructor Notes

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University of Phoenix OnlineCourse: RES / 341Final Exam(Chapters 9+17 from Applied Statistics in Business and Economics )SOLUTIONPlease mark one answer for all multiple choice questions with RED!Chapter 91. In hypothesis testing, Type I error isA) always equal to 5 percent.

B) always smaller or equal to 5 percent.

C) the probability of rejecting H0 when H0 is true.

D) the probability of rejecting H0 when H1 is true.

Answer: C2. In hypothesis testing, Type II error isA) equal to 1 - probability of committing Type I error.

B) equal to 5 percent or more.

C) the probability to accept H0 when H0 is true.

D) the probability to accept H0 when H1 is true.

Answer: D3. The probability of Type I error, , and the probability of Type II error,
D) has all of the above characteristics.

Answer: D15. The critical valueA) is calculated from the sample.

B) is usually 0.05 or 0.01.

C) divides the acceptance region from the rejection region.

D) is determined by the test statistic.

Answer: CUse the following to answer 16-18Dullco Manufacturing claims that its alkaline batteries last forty hours on average in a certain type of portable CD player. Tests on a random sample of 18 batteries from a day's production run of 2,850 batteries showed a mean battery life of 37.8 hours with a standard deviation of 5.4 hours.

16. The test statistic isA) 1.980B) 1.728C) 2.101D) 1.960Answer: B17. In determining the p-value for reporting the study's findings, which of the following is true?A) The p-value is less than .05.

B) The p-value is equal to .

C) The p-value is greater than .05.

D) The p-value cannot be determined without specifyingAnswer: A18. In a left-tailed test at α = .05 we wouldA) comfortably reject the claim.

B) comfortably accept the claim.

C) feel uncomfortable with either decision (too close).

D) switch to alpha of 0.01 for a more powerful test.

Answer: A19. Which of the following statements are correct?A) For a given level of significance, the critical value of Student's t increases as n increases.

B) A test statistic of t = 1.813 with d.f. = 15 leads to a clear-cut decision.

C) It is harder to reject the null hypothesis when conducting a two-tailed test rather than a