Question

The scores for the test # 3 for Abe’s stat class from 9 randomly selected students are as such 86 ,70, 95, 90, 77, 88, 85, 92, 90. By using 95% confidence level, find the confidence interval for the average test score for test # 3 for all Abe’s stat class.

7) A) E =5.85 B) E = 6.28 C) E =6.02 D) E = 5.89

8) A) 79.87 < < μ 91.91 B) 83.24 < < μ 121.27 C) 101.65 < μ < 122.34 D) 87.35 < μ < 95.82

Answer 1

Solution:-
7) option C) 6.02

8) option A) 79.87 < < μ 91.91

Explanation:-

Given that 86,70,95,90,77,88,85,92,90

Mean = 85.89, sd = 7.83