Exhibit 10-3 A Statistics Teacher Wants to See If There Is Any

Multiple Choice

Exhibit 10-3
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 information.
-Refer to Exhibit 10-3. The standard error of is

A) 12.9
B) 9.3
C) 4
D) 2