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 ar allowed, but they call for the average to be 10 or below. The firm examined 35 randomly chosen fax transmissions during the following(a) year, yielding a sample mean of 14.44 with a measurement 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 captious value for one-tail test with alpha=1% and df=34 is 2.3263 taste 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 more than smaller than 1% this is very backbreaking evidence for rejecting Ho and supporting Ha. 9.56 A fall was flip ped 60 times and came up heads 38 times. (a) At the .10 level of significance, is the coin influenceed toward heads? Show your stopping point 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 preconceived idea 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 atomic number 18 received. If 485 out(a) 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 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 mathem! atical operation indemnification 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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