A Social Scientist Claims That the Average Adult Watches Less

Essay

A social scientist claims that the average adult watches less than 26 hours of television per week. He collects data on 25 individuals' television viewing habits, and finds that the mean number of hours that the 25 people spent watching television was 22.4 hours. If the population standard deviation is known to be 8 hours, can we conclude at the 1% significance level that he is right?