A parenting magazine reports that the average amount of wireless data used by teenagers each month is 7Gb. For her science fair project, Ella sets out to prove the magazine wrong. She claims that the mean among teenagers in her area is less than reported. Ella collects information from a simple random sample of 4 teenagers at her high school, and calculates a mean of 5.8Gb per month with a standard deviation of 1.9Gb per month. Assume that the population distribution is approximately normal. Test Ella's claim at the 0.005level of significance.

Step3of3:

Draw a conclusion and interpret the decision.