Question

Problem 65

Answer 1

Given information

One claim is that teenagers spent 4.5 hours per week, on average, on the phone while another is that the mean is higher.

The null and alternate hypothesis  are to be stated.

Step-by-step explanation

Step 1.

Let  be the mean number of hours per week that teenagers spend on the phone. The claim that teenagers spend 4.5 hours per week on the phone can be represented as:

 

Since the claim contains the equality, it is the null hypothesis.

The claim that the mean is higher than 4.5 hours can be represented as:

 

Since the claim contains the inequality it is the alternate hypothesis.