The following data represent scores of sample of 50 randomly selected students on standardized test.
39 48 55 63 66 68 68 69 70 71
71 71 73 74 76 76 76 77 78 79
79 79 79 80 80 82 83 83 83 85
85 86 86 88 88 88 88 89 89 89
90 91 92 92 93 95 96 97 97 99
a. Write a 95% confidence interval for the mean score of all students who took the test.
b. Identify the target parameter and the point estimator.