a school administrator claims that the average gpa of the senior class is 3.53. you think that the average gpa is greater than that, so you select a random sample of 100 seniors and calculate their average gpa. the sample mean gpa is 3.70. you have some evidence that the mean gpa may be greater than 3.53 because the sample mean of your random sample is 3.70. which explanations are justified based on the evidence you obtained? check all that apply.