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. 11, 9, 8, 10,
10, 9, 7, 11, 11, 7, 6, 9, 10, 8, 10. From past studies, the publisher assumes o
is 1.5 minutes and that the population of times is normally distributed. The
90% confidence interval for uis
(Sample mean = 9.1)