Instruction 10-4
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.
$$\begin{array} { c c c }
\text { Student } & \begin{array} { c }
\text { Exam Score } \
\text { Before Course }
\end{array} & \begin{array} { c }
\text { Exam Score } \
\text { After Course (2) }
\end{array} \
& ( 1 ) & \
1 & 530 & 670 \
2 & 650 & 770 \
3 & 910 & 1,000 \
4 & 700 & 710 \
5 & 450 & 550 \
6 & 820 & 870 \
7 & 820 & 770 \
8 & 630 & 610
\end{array}$$
-Referring to Instruction 10-4,the number of degrees of freedom is
A) 7.
B) 14.
C) 8.
D) 13.

Question

Instruction 10-4
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.
 $$\begin{array} { c c c } 
\text { Student } & \begin{array} { c } 
\text { Exam Score } \
\text { Before Course }
\end{array} & \begin{array} { c } 
\text { Exam Score } \
\text { After Course (2) }
\end{array} \
& ( 1 ) & \
 1  & 530 & 670 \ 
2 & 650 & 770 \
3 & 910 & 1,000 \
4 & 700 & 710 \
5 & 450 & 550 \
6 & 820 & 870 \
7 & 820 & 770 \
8 & 630 & 610
\end{array}$$
-Referring to Instruction 10-4,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 sample t-test, which is appropriate for this before-and-after comparison, is calculated as $n - 1$, where $n$ is the number of pairs. Here, $n = 8$ (the number of students), so the degrees of freedom is $8 - 1 = 7$.

Instruction 10-4 to Test the Effectiveness of a Business School

Instruction 10-4
to Test the Effectiveness of a Business School