Use the data in 401KSUBS.RAW for this exercise.
1. Compute the average, standard deviation, minimum, and maximum values of nettfain the sample.
2. Test the hypothesis that average nettfadoes not differ by 401(k) eligibility status; use a two-sided alternative. What is the dollar amount of the estimated difference?
3. From part (ii) of Computer Exercise C9, it is clear that e401kis not exogenous in a simple regression model; at a minimum, it changes by income and age. Estimate a multiple linear regression model