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 be allowed, but they call for the average to be 10 or below. The firm examined 35 randomly chosen fax transmissions during the neighboring year, yielding a sample mean of 14.44 with a bill deviation of 4.45 pages. (a) At the .01 level of significance, is the true mean great than 10? Ho: mu = 10 Ha: mu > 10 captious value for one-tail test with alpha=1% and df=34 is 2.3263 tryout 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 overmuch smaller than 1% this is very backbreaking evidence for rejecting Ho and supporting Ha. 9.56 A fall was flipped 60 ti mes and came up heads 38 times. (a) At the .10 level of significance, is the coin influenceed toward heads? Show your finding 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 deflect 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 ar r eceived. If 485 out(a) of the next d order! s 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 insurance policy 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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