Exhibit 9-7 A Random Sample of 16 Statistics Examinations from a Large

Multiple Choice

Exhibit 9-7
A random sample of 16 statistics examinations from a large population was taken. The average score in the sample was 78.6 with a variance of 64. We are interested in determining whether the average grade of the population is significantly more than 75. Assume the distribution of the population of grades is normal.
-Refer to Exhibit 9-7. The test statistic is

A) 0.45
B) 1.80
C) 3.6
D) 8