SCENARIO 10-5
To test the effectiveness of a business school preparation course, 8 students took a general business
test before and after the course. The results are given below. $\begin{array}{lcc}
\text { Student } & \begin{array}{c}
\text { Exam Score } \
\text { Before Course (1) }
\end{array} & \begin{array}{c}
\text { Exam Score } \
\text { After Course (2) }
\end{array} \
\hline 1 & 530 & 670 \
2 & 690 & 770 \
3 & 910 & 1,000 \
4 & 700 & 710 \
5 & 450 & 550 \
6 & 820 & 870 \
7 & 820 & 770 \
8 & 630 & 610
\end{array}$

-Referring to Scenario 10-5, the value of the sample mean difference is _______ if the difference scores reflect the results of the exam after the course minus the results of the exam before the
Course.
A) 0
B) 50
C) 68
D) 400

Question

SCENARIO 10-5
To test the effectiveness of a business school preparation course, 8 students took a general business
test before and after the course. The results are given below. $\begin{array}{lcc}
\text { Student } & \begin{array}{c}
\text { Exam Score } \
\text { Before Course (1) }
\end{array} & \begin{array}{c}
\text { Exam Score } \
\text { After Course (2) }
\end{array} \
\hline 1 & 530 & 670 \
2 & 690 & 770 \
3 & 910 & 1,000 \
4 & 700 & 710 \
5 & 450 & 550 \
6 & 820 & 870 \
7 & 820 & 770 \
8 & 630 & 610
\end{array}$

-Referring to Scenario 10-5, the value of the sample mean difference is _______ if the difference scores reflect the results of the exam after the course minus the results of the exam before the
Course.
A) 0
B) 50
C) 68
D) 400

Quizplus · Accepted Answer

The sample mean difference is calculated by finding the average of the differences between the after and before scores for all students. The differences are: 140, 80, 90, 10, 100, 50, -50, -20. The mean of these differences is 50.

SCENARIO 10-5 to Test the Effectiveness of a Business School

SCENARIO 10-5
to Test the Effectiveness of a Business School