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

Question

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

Quizplus · Accepted Answer

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

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