A parenting magazine reports that the average amount of wireless data used by teenagers each month is 10GB. For her science project, Ella sets out to prove the magazine wrong. She claims that mean among teenagers in her area is less than reported. Ella collects information from a simple random sample of 25 teenagers at her high school and calculates a mean of 9.8 Gb per month with a standard deviation of 2.7 Gb per month. Test Ella's claim at the 0.01 of significance and assume that the distribution of wireless data usage is approximately normal.

Ella has written out a hypothesis test for this problem using the eight step process we have discussed in class this semester. However, she has had trouble interpreting the steps. She has listed some questions for you as her teacher to better understand the Hypothesis Testing steps. Please answer each question below in bold related to the steps of the hypothesis test she has indicated.

Let