Behaviorism of Z-Test

1) Very fit nodes give the XYZ-Box video game exercise a rating that is at least 42. Suppose that the maker of the XYZ-Box wishes to routine the random sample of 65 felicity ratings to arsehole evidence supporting the yell that the mean composite repose rating for the XYZ-Box exceeds 42. a. Letting ? represent the mean composite gladness rating for the XYZ-Box, set up the zilch and alternative hypotheses contain if we wish to attempt to provide evidence supporting the title of respect that ? exceeds 42. H0: ??42 H1: ?>42 b. In the context of this situation, interpret making a emblem I misplay; interpret making a slip II error. Type I (?): reject the null dead reckoning when the null surmisal is true. That is, claim customer is actually satisfied when actually the customer is not very satisfied. Type II (?): fail to reject the null assumption when the null hypothesis is false. That is, when actual customer is very satisfied, we prospect they argon not very satisfied. 2) How do we decide whether to utilize a z test or a t test when scrutiny a hypothesis about a population mean? When the population variance is known, then exercise z-test, otherwise use t-test. 3) A wholesaler has recently unquestionable a computerized sales invoicing trunk. Prior to implementing this system, a manual system was used.

The distribution of the round of errors per invoice for the manual system is as follows: Errors per invoice0123More Than 3 Percentage of Invoices87%8%3%1%1% After slaying of the computerized system, a random sample of ergocalciferol invoices gives the following error distribution: Errors per invoice0123More Than 3 Numbers of Invoices47910821 a. level ! that it is appropriate to make out a chi-square test engagement these data. n*p0=500*0.87=435 n*p1=500*0.08=40 n*p2=500*0.03=15 n*p3=500*0.01=5 n*p4=500*0.01=5 all of them are greater than or equal to 5, so it is appropriate to carry out a chi-square test. b. Use the following...If you want to get a full essay, severalise it on our website: OrderEssay.net

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