4.22 Because elderly people may have difficulty standing straight to have their heights measured, a study looked at predicting overall height from height to the knee. Here are the data (in centimeters, cm) for five elderly men:

Knee height x (cm) 57.7 47.4 43.5 44.8 55.2 Overall height y (cm) 192.1 153.3 146.4 162.7 169.1 Use your calculator or software: What is the equation of the least-squares regression line for predicting height from knee height?

a. y^=2.4+44.1x

b. y^=44.1+2.4x

c. y^=-2.5+0.32x