Question: Suppose that yield the following regression results:
Another researcher is interested in the same regression, but he makes an error when he enters the data into his regression program: He enters each observation twice, so he has 200 observations (with observation 1 entered twice, observation 2 entered twice, and so forth).
a. Using these 200 observation, what results will be produced by his regression program? (Hint: Write the "incorrect" values of the sample means, variance and covariances of Y and X as functions of the "correct" values. Use these to determine the regression statistics.)
b. Which (if any) of the internal validity conditions are violated?