A Statistics Teacher Wants to See If There Is Any

Multiple Choice

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. ​ The test statistic for the difference between the two population means is

A) -.47.
B) -.65.
C) -1.5.
D) -3.0.