An ongoing study of wolves is being conducted at the Yukon-Charley Rivers National Preserve. Table D.9 in the Data Bank gives the physical characteristics of wolves that were captured.

(a) Plot length versus weight for the female wolves. From your visual inspection, estimate the value of the correlation coefficient.
(b) Calculate the sample correlation coefficient for female wolves.

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Females Body length (cm) 123 129 143 124 125 122 125 122 Weight (Ib) 57 84 90 71 71 77 68 73