Estimate a linear regression model for mutual fund losses on November 13, 1989, using the data file New York Stock Exchange Gains and Losses.
a. Use an unbiased estimation procedure to obtain a point estimate of the variance of the error terms in the population regression.
b. Use an unbiased estimation procedure to obtain a point estimate of the variance of the least squares estimator of the slope of the population regression line.
c. Find $90 \%, 95 \%$, and $99 \%$ confidence intervals for the slope of the population regression line.