CCN and ActMedia provided a television channel targeted to individuals waiting in supermarket checkout lines. The channel showed news, short features, and advertisements. The length of the program was based on the assumption that the population mean time a shopper stands in a supermarket checkout line is 8 minutes. A sample of actual waiting times will be used to test this assumption and determine whether actual mean waiting time differs from this standard.

(b)

A sample of 110 shoppers showed a sample mean waiting time of 8.4 minutes. Assume a population standard deviation of

= 3.2 minutes.

What is the test statistic? (Round your answer to two decimal places.)

What is the p-value? (Round your answer to four decimal places.)

p-value =

(d)

Compute a 95% confidence interval for the population mean. (Round your answers to two decimal places.)

blank to blank