Refit the simple regression model, but to the following subsets of the data: (1) all observations with |x| 2/3, and (3) all observations with x 2 , and the value of R 2 for these three cases and for...

Refit the simple regression model, but to the following subsets of the data: (1) all observations with |x| <> 2/3, and (3) all observations with x <>², and the value of R²
for these three cases and for the regression fit to all the data.