A parenting magazine reports that the average amount of wireless data used by teenagers each month Il Gb For her science fair project la sets out to prove the magazine wrong She claims that the mean among teenagers in her areas less than reported Ella collects information from a simple random sample of 4 teenagers at her high school and calculates a mean of 9.2 Gb per month with a standard deviation of 1.4 Gb per month. Assume that the population distribution is approximately normal.


Required:

a. Test Elia's claim at the 0.10 level of significance.

b. State the null and alternative hypotheses for the test.