Suppose that n = 50, i.i.d. observations for (Yi, Xi) yield the followingregression results:                      Ŷ= 49.2 + 73.9X, SER = 13.4, R2 = 0.78.                                        (23.5) (16.4)Another researcher is interested in the same regression, but makes an errorwhen entering the data into a regression program: The researcher enterseach observation twice, ending up with 100 observations (with observation1 entered twice, observation 2 entered twice and so forth).a. Using these 100 observations, what results will be produced by theregression program? (Hint: Write the “incorrect” values of the samplemeans, variances, and covariances of Y and X as functions of the “correct”values. Use these to determine the regression statistics.)           Ŷ = ____ + ____X, SER = ____, R2 = ____.                             (____) (____)b. Which (if any) of the internal validity conditions are violated?

Suppose that n = 50, i.i.d. observations for (Y_i, X_i) yield the following
regression results:
                      Ŷ= 49.2 + 73.9X, SER = 13.4, R² = 0.78.
                                        (23.5) (16.4)
Another researcher is interested in the same regression, but makes an error
when entering the data into a regression program: The researcher enters
each observation twice, ending up with 100 observations (with observation
1 entered twice, observation 2 entered twice and so forth).
a. Using these 100 observations, what results will be produced by the
regression program? (Hint: Write the “incorrect” values of the sample
means, variances, and covariances of Y and X as functions of the “correct”
values. Use these to determine the regression statistics.)
           Ŷ = ____ + ____X, SER = ____, R² = ____.
                             (____) (____)
b. Which (if any) of the internal validity conditions are violated?