Problem 106a

Given information

Previously, an organization reported that teenagers spent  hours per week, on average, on the phone. The organization thinks that, currently, the mean is higher. Fifteen randomly chosen teenagers were asked how many hours per week they spend on the phone. The sample mean was    hours with a sample standard deviation of  Conduct a hypothesis test.

Step-by-step explanation

We are given to use a right-tailed test. That’s why the alternative hypothesis has sign. The critical value of value for the critical region is . So, reject null hypothesis if .

It is given in the problem that,

and