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 p-value for the difference between the two population means is
A).0014
B).0028
C).4986
D).9972

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 p-value for the difference between the two population means is
A).0014 
B).0028 
C).4986 
D).9972

Quizplus · Accepted Answer

The p-value for the difference between the two population means is shown as 0.0056 in the table. Since this is a two-tailed test, we need to double this probability to get the actual p-value. Therefore, the final p-value is 0.0112. Comparing this to the significance level of 0.05, we can see that it is less than the significance level, but just barely. Therefore, we can conclude that there is a statistically significant difference in the abilities of students enrolled in statistics today and those enrolled five years ago, but the effect size may be small. The answer is B, which represents the closest value to 0.0112.

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