Assume Population Normal..
NAME
From past experience, a teacher believes that the average score on a real estate
exam is 75. A sample of 20 students' exam scores is as follows:
80, 68, 72, 73, 76, 81, 71, 71, 65, 50,
63, 71, 70, 70, 76, 75, 69, 70, 72, 74
Can the teacher conclude that the students; average is still 75? Use a=0.01
Show all three methods: traditional, p-value, Confidence interval.