A statistics teacher wants to see if there is any difference in the abilities of students enrolled in statistics today and those enrolled five years ago. A sample of final examination scores from students enrolled today and from students enrolled five years ago was taken. You are given the following results.

Today Five Years Ago

Mean 82 88

Variance 112.5 54

Sample Size. 45 36

The point estimate for the standard deviation of the difference between the means of the two populations is

Select one:

A.12.9

B.9.3

C.4

D.2