Because elderly people may have difficulty standing to have their heights measured, a study looked at predicting overall height from the height to the knee. Here are the data (in centimeters) for five elderly men:
|
Knee height xx
|
55.9
|
45.6
|
42.1
|
45
|
54.8
|
|
Height yy
|
191.3
|
152.9
|
144.5
|
162.2
|
168.9
|
Use your calculator or software: the correlation between knee height and overall height is about