Statistics

E-Text Exercises Latasha Bell University of Phoenix Olivia Scott April 24, 2012 9.54 Faced with rising fax costs, a firm issued a guideline that transmission of 10 pages or more should be sent by 2-day mail instead. Exceptions argon allowed, but they call for the average to be 10 or below. The firm examined 35 randomly chosen fax transmissions during the beside year, yielding a sample mean of 14.44 with a streamer deviation of 4.45 pages. (a) At the .01 level of significance, is the true mean greater than 10? Ho: mu = 10 Ha: mu > 10 hypercritical value for one-tail test with alpha=1% and df=34 is 2.3263 test statistic: t(14.44) = (14.44-10)/[4.45/(sqrt35)] = 5.9028 (b) Use Excel to find the right-tail p-value. P-value = P(5.9028 < t < 10) = 0.00000057579... Since the p-value is so practically smaller than 1% this is very backbreaking evidence for rejecting Ho and supporting Ha. 9.56 A fall was flippe d 60 times and came up heads 38 times. (a) At the .10 level of significance, is the coin influenceed toward heads? Show your finality rule and calculations. Yes. p-hat = x/n = 38/60 = 19/30 Ho: p = 1/2 Ha: p > 1/2 Critical value: z = 1.28 Test statistic: z(19/30) = (0.633333-0.5)/sqrt[(.5)(.

5)/60] (b) Calculate a p-value and interpret it. P (2.065 < z < 10) = 0.019. The probability the test results could have produced even stronger evidence of the coins turn towards heads is 0.019. 9.62 The Web-based company Oh Baby! Gifts has a goal of processing 95 percent of its orders on the very(prenominal) day they be received. If 485 out(a) of th! e next euchre orders are processed on the same day, would this prove that they are exceeding their goal, using ? = .025? (See story.news.yahoo.com accessed (June 25, 2004.) Ho: p = 0.95 Ha: p > 0.95 p-hat = 485/500 = 0.97 Critical value for one-tail z test with alpha = 0.025 = 1.96 9.64 An auditor reviewed 25 oral mathematical operation damages claims from a particular surgical office,...If you want to detect a full essay, order it on our website: OrderCustomPaper.com

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