The video game satisfaction rating case
the means of the sample of 65 customer satisfaction ratings in table 1.7 is 42.95. if we let u denote the mean of all possible customer satisfaction ratings for the xyz box video game system, and assume that the population standard deviation equals 2.64:
a. calculate 95 percent and 99 percent confidence intervals for u.
b. using the 95 percent confidence interval, can we be 95 percent confidence intervals for u.
(recall that a very satisfied customer gives a rating of at least 42)? explain
c. using the 99 percent confidence interval, can we be 99 percent confident that u is at least 42? explain.
d. based on your answers to parts b and c, how convinced are you that the mean satisfaction rating is at least 42?