The data below are the number of absences and the final grades of 9 randomly selected students from a statistics class. Calculate the correlation coefficient, r. $$\begin{array} { l | c | c | c | c | c | c | c | c | c | }
\text { Number of absences, } \mathrm { x } & 0 & 3 & 6 & 4 & 9 & 2 & 15 & 8 & 5 \
\hline \text { Final Grade, } \mathrm { y } & 93 & 81 & 75 & 77 & 66 & 87 & 50 & 71 & 77
\end{array}$$
A)-0.991
B)-0.888
C)-0.918
D)-0.899

Question

The data below are the number of absences and the final grades of 9 randomly selected students from a statistics class. Calculate the correlation coefficient, r. $$\begin{array} { l | c | c | c | c | c | c | c | c | c | } 
\text { Number of absences, } \mathrm { x } & 0 & 3 & 6 & 4 & 9 & 2 & 15 & 8 & 5 \
\hline \text { Final Grade, } \mathrm { y } & 93 & 81 & 75 & 77 & 66 & 87 & 50 & 71 & 77
\end{array}$$
A)-0.991
B)-0.888
C)-0.918
D)-0.899

Quizplus · Accepted Answer

The correct answer is A because the correlation coefficient, r, is -0.991. This indicates a strong negative correlation between the number of absences and the final grades.

The Data Below Are the Number of Absences and the Final