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 95% confidence interval for the difference between the two population means is
A)-9.92 to -2.08
B)-3.92 to 3.92
C)-13.84 to 1.84
D)-24.228 to 12.23

Question

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 95% confidence interval for the difference between the two population means is
A)-9.92 to -2.08 
B)-3.92 to 3.92 
C)-13.84 to 1.84 
D)-24.228 to 12.23

Quizplus · Accepted Answer

The confidence interval for the difference between two population means is calculated using the sample means, standard deviations, and sample sizes. The interval A (-9.92 to -2.08) is likely the correct calculation based on the given data in Exhibit 10-3.

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