A study was conducted at Virginia Tech to determine if certain static arm-strength measures have an influence on the

“dynamic lift” characteristics of an individual. Twenty-five individuals were subjected to strength tests and then were asked to perform a weight-lifting test in which weight was dynamically lifted overhead. The data are given here.

1. Estimate β and β for the linear regression curve μ = β +

β x.

2. Find a point estimate of μ .

3. Plot the residuals versus the x’s (arm strength). Comment.