x ‾ s x y ‾ s y r y ^ = b 0 + b 1 x 30 ? 6 9 6 y ^ = − 84 + 18 x \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} x 30 s x ? y 6 s y 9 r 6 y ^ = b 0 + b 1 x y ^ = − 84 + 18 x A) 2B) 4C) 3D) 9E) 7

Question

x ‾ s x y ‾ s y r y ^ = b 0 + b 1 x 30 ? 6 9 6 y ^ = − 84 + 18 x \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} x 30 ​ s x ​ ? ​ y ​ 6 ​ s y ​ 9 ​ r 6 ​ y ^ ​ = b 0 ​ + b 1 x ​ y ^ ​ = − 84 + 18 x ​ ​ A) 2B) 4C) 3D) 9E) 7

Absidy Amador · Accepted Answer

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

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