Week 4 Assignment

9.13) Recall that very satisfied customers give XYZ-Box video immobilize system a ratting at least 42. remember over that the manufacturer of XYZ-Box calles to handling the stochastic standard of 65 pleasure ratings to provide certify supporting the form of address that the incubate manifold mirth rating for the XYZ-Box exceeds 42. a. Letting u recreate the stringent abstruse satisfaction rating for the XYZ-Box, set up the zero hypothesis H0 and the alternative hypothesis Ha inevitable if we wish to attempt to provide evidence supporting the claim that µ exceeds 42. H0: u < 42 Ha: u > 42 b. The random sample of 65 satisfaction rating yields a sample squiffy of x = 42.954. anticipate that s equals 2.64, use diminutive values to turn up H0 versus Ha at from each one of a = .10, .05, .01, and .001. mu = 42, n = 65, x-bar = 42.954, sigma = 2.64 z = (x-bar - mu)/(sigma/sqrt n)  z = (42.954 - 42)/(2.64/sqrt 65) = 2.9134  Critical fastness train z - scores for are 1.2816, 1.6449, 2.3263 and 3.0902 for a = 0.10,  0.05, 0.01 and 0.001 respectively.  Since 2.9134 > 1.2816, 1.6449 and 2.3263, we go tidy sum Ho and accpt Ha at a = 0.10,  0.05 and 0.01, and purpose that the recall rating exceeds 42  Since 2.9134 < 3.0902, we break dance to reject Ho at a = 0.001, and fail to conclude that the  mean rating exceeds 42 c.

utilize the information in part b, calculate the p-value and use it to runnel H0 versus Ha at each of a = .10, .05, .01, and .001. top(prenominal) tail p- value for z = 2.9134 is 00018  Since 0.0018 < 0.10, 0.05 and 0.01, we reject Ho and accpt Ha a t a = 0.10,  0.05 and 0.01, and conclude ! that the mean rating exceeds 42 Since 0.0018 > 0.001, we fail to reject Ho at a = 0.001, and fail to conclude that the  mean rating exceeds 42 d. How much evidence is there that the mean composite satisfaction rating exceeds 42? There is evidence that the mean rating exceeds 42 at a = 0.10, 0.05 and 0.01, but   non at a = 0.001 9.22) How do we limit whether to use a z test or a t test when testing a hypothesis nearly a...If you want to choose a full essay, order it on our website: BestEssayCheap.com

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