In an Area of the Midwest, Records Were Kept on the Relationship

Multiple Choice

In an area of the Midwest, records were kept on the relationship between the rainfall (in inches) and the yield of wheat (bushels per acre) . Calculate the correlation coefficient, r. $$\begin{array} { l | c | c | c | c | c | c | c | c | c | } \text { Rain fall (in inches) , } x & 9.5 & 7.8 & 12.4 & 11.5 & 17.8 & 9.3 & 6 & 14.6 & 15 \\\hline \text { Yield (bushels per acre) , y } & 45.5 & 41.2 & 53.8 & 54 & 77.4 & 44.2 & 26.9 & 71 & 73.8\end{array}$$

A) 0.981
B) 0.998
C) 0.900
D) 0.899