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.
Today
Five Years Ago
82
88
?2112.5
54
n45
36
?
The standard error of 
- 
is
A. 12.9.
B. 9.3.
C. 4.
D. 2.
Answer: D
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