$\begin{array}{c|c|c|c|c|c}
\overline{\mathrm{x}} & \mathrm{s}_{\mathrm{x}} & \overline{\mathrm{y}} & \mathrm{s}_{\mathrm{y}} & \mathrm{r} & \hat{\mathrm{y}}=\mathrm{b}_{0}+\mathrm{b}_{1 \mathrm{x}} \
\hline 30 & ? & 6 & 9 & 6 & \hat{y}=-84+18 \mathrm{x}
\end{array}$
A)2
B)4
C)3
D)9
E)7

Question

Quizplus · Accepted Answer

The correlation coefficient $ r $ must be between -1 and 1, so 6 is incorrect. The correct value for $ r $ should be 0.3, making the missing value for $ \mathrm{s}_{\mathrm{x}} $ equal to 3.

A)2 B)4 C)3 D)9 E)7

A)2
B)4
C)3
D)9
E)7