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
Definitions:
Value
Refers to the importance, worth, or usefulness of something, often determined by its desirability, utility, or contribution to achieving a goal.
Multiple Regression Model
A statistical technique that uses multiple independent variables to forecast the outcome and determine the effect of each variable on the dependent variable.
Correlation
A statistical measure that expresses the extent to which two variables change together, ranging from -1 to +1.
Null and Alternative Hypotheses
The null hypothesis is a statement of no effect or no difference, and the alternative hypothesis is what we aim to support, indicating some effect or difference.
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Q132: Refer to Exhibit 10-11. The null hypothesis<br>A)should