For Exercises 51–58, do the following:

  1. State the hypotheses and the rejection rule.
  2. Calculate .
  3. Find the -value.
  4. State the conclusion and the interpretation.

Question 9.158

52. Mobile Apps. In 2014, Nielsen reported that young people ages 18–24 spent 37 hours per month using the apps on their mobile devices. Suppose that a random sample of 100 people ages 18–24 showed a sample mean of 40 hours. Assume . Test whether the population mean number of hours using mobile apps by young people ages 18–24 has increased, at level of significance .