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.
$$\begin{array} { c c c }
\text { Student } & \begin{array} { c }
\text { Exam Score } \
\text { Before Course (1) }
\end{array} & \begin{array} { c }
\text { Exam Score } \
\text { After Course (2) }
\end{array} \
\hline { 3 - 3 } 2 & 530 & 670 \
2 & 690 & 770 \
3 & 910 & 1,000 \
4 & 700 & 710 \
5 & 450 & 550 \
6 & 820 & 870 \
7 & 820 & 770 \
8 & 630 & 610
\end{array}$$
-Referring to Instruction 10-5,the number of degrees of freedom is
A)7.
B)14.
C)8.
D)13.

Question

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.
 $$\begin{array} { c c c } 
\text { Student } & \begin{array} { c } 
\text { Exam Score } \
\text { Before Course (1) }
\end{array} & \begin{array} { c } 
\text { Exam Score } \
\text { After Course (2) }
\end{array} \
\hline { 3 - 3 } 2 & 530 & 670 \
2 & 690 & 770 \
3 & 910 & 1,000 \
4 & 700 & 710 \
5 & 450 & 550 \
6 & 820 & 870 \
7 & 820 & 770 \
8 & 630 & 610
\end{array}$$
-Referring to Instruction 10-5,the number of degrees of freedom is
A)7.
B)14.
C)8.
D)13.

Quizplus · Accepted Answer

The degrees of freedom for a paired t-test is calculated as the number of pairs minus one. Since there are 8 students (pairs), the degrees of freedom is 8 - 1 = 7.

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

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