For his senior project, Jerry wants to know the average GPA of students at his high school. He surveys 27 students and finds that the sample has a mean GPA of 2.45 and standard deviation of 0.63. Construct a 98 % confidence interval for the population mean GPA. Assume the population is normally distributed. Choose the correct confidence interval and critical value used in the calculation. O (2.15, 2.75) (to = 2.4786) O (2.17, 2.73) (Zc = 2.326) O (2.2, 2.7) (Zc = 2.054) O (2.15, 2.75) (to = 2.4671) O (2.15, 2.75) (to = 2.4727)