Researchers Investigating the Association Between the Size and Strength of Muscles

Essay

Researchers investigating the association between the size and strength of muscles
measured the forearm circumference (in inches) of 20 teenage boys. Then they measured
the strength of the boys' grips (in pounds). Their data are plotted.
a. Write a few sentences describing the association.
b. Estimate the correlation. $r =$ __________
c. If the point in the lower right corner (at about 14" and 38 lbs.) were removed, how would
the correlation become stronger, weaker, or remain about the same?
d. If the point in the upper right corner (at about 15" and 75 lbs.) were removed, would the
correlation become stronger, weaker, or remain about the same?