Solved

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

Question 57

Multiple Choice

Instruction 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.
 Student  Exam Score  Before Course (1)   Exam Score  After Course (2)  332530670269077039101,00047007105450550682087078207708630610\begin{array} { c c c } \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 { 3 - 3 } 2 & 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 Instruction 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) 400
B) 50
C) 68
D) 0

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