Recall that precise satisfied customers give the XYZ-Box video game system a rating that is at least 42. Suppose that the manufacturer of the XYZ-Box wishes to determination the hit-or-miss take in of 65 gratification ratings to provide reason supporting the claim that the mean composite triumph ratings for the XYZ-Box croak 42.
a. Letting u represent the mean composite satisfaction rating for the XYZ-Box, set up the null hypothesis H and the alternative hypothesis H needed if we wish to establish to provide evidence supporting the claim that u exceeds 42.
b. The random sample of 65 satisfaction rating yields a sample mean of x = 42.954. Assuming that q equals 2.64, intent critical value to test H versus H at each of a = .10 .05, .01, and .001.
c. Using the information in part b, calculate the p-value and use it to test H versus H at each of a = .10,.05,.01, and .001
d. How much evidence is there that the mean composite satisfaction rating exceeds 42?
9.22 Concepts
How do we decide whether to use a z test or a t test when testing a hypothesis about a universe mean?
12.10 A wholesaler has recently developed a computerized sales invoicing system. Prior to implementing this system, a manual system was used.
The dispersal of the number of errors per invoice for the manual system is as follows:
Errors per throwaway 0 1 2 3 More Than 3
share of Invoices 87% 8% 3% 1% 1%
after implementation of the computerized system, a random sample of 500 invoices gives the followers error distribution:
Error per Invoice 0 1 2 3 More Than 3
Number of Invoices 479 10 8 2 1
a. Show that it is appropriate to carry out a chi-square test using these data
b. Use the following Excel getup to determine whether the error percentage for the computerized system differ from those for the manual...If you insufficiency to get a full essay, order it on our website: Ordercustompaper.com
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