9

A publisher wants to estimate the mean length of time in minutes all adults spend reading newspapers. To determine this estimate, the publisher takes a random sample of 15 people and obtains the following results: mean is 18.7 minutes and standard deviation of 1.2 minutes. Construct the 95% confidence interval. Round all calculations to the nearest hundredth.

n =

x-bar =

standard deviation =

critical value =

E =

confidence interval:______________< <______________