342Exam

9.54 Faced with rising telecommunicate costs, a firm issued a guideline that transmissions of 10 pages or more should be sent by 2-day mail instead. Exceptions atomic hail 18 allowed, but they wishing the average to be 10 or below. The firm examined 35 indiscriminately chosen fax transmissions during the coterminous year, yielding a sample recall of 14.44 with a precedent deflexion of 4.45 pages. (a) At the .01 train of significance, is the squ ar(a) mean great than 10? (b) Use Excel to go back the right-tail p- repute. (a) H0: mu = 10 H1: mu > 10 one-tail t-test with a = 0.01; vital value for 34 df = 2.326 leaven statistic: T = (14.44-10)/[4.45/sqrt(35)] = 5.9028 Since T > 2.326 weject H0 and decide that on that point is statistical evidence that the legitimate mean is > 10 (b) p-value = 0.00000057579 9.56 A coin was flipped 60 times and came up heads 38 times. (a) At the .10 level of significance, is the coin biased toward heads? describe your decision ordinance and calculations. (b) conduct a p-value and interpret it. (a) phat = 38/60 = 0.6333 H0: p = 0.5 H1: p > 0.5 a = 0.10 Test statistic Z = (phat - p)/sqrt[p(1-p)/n] = (0.6333 - 0.5)/sqrt[0.5(1-0.5)/60] = 2.065 Decision normal: abandon H0 if Z > 1.2816 Since 2.065 > 1.2816 we extinguish H0 and eject down that the coin is biased. (b) p-value = 0.

019434 Since the p-value < 0.10 we repudiate the null hypothesis and close down that the coin is biased. 9.62 The Web-based company Oh frustrate! Gifts has a goal of process 95 percent of its hallows on the same day they ar received. If 485 out of the next vitamin D orders are processed on the same day, would this prove that they are exceeding their goal, using ? = .025? (See story.news.yahoo.com) access H0: p = 0.95 H1: p > 0.95 Decision want: Reject H0 if z > 1.96. Test statistic Z = (phat-p)/sqrt[p*(1-p)/n] = (485/500-0.95)/sqrt(0.95*(1-0.95)/500) = 2.0519 Since 2.01519 > 1.96 we reject H0 and close that they are exceeding their goal. 9.64 An listener reviewed 25 oral working(a) procedure insurance...If you want to learn a full essay, order it on our website: Ordercustompaper.com

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