i don't understand how to do the questions beneath the table

Predictive Modeling I Predictive Modeling I Midterm exam (due date: March 6 for in-class students) Q1. On April 1, 1992, New Jersey's minimum wage was increased from $4.25 to $5.05 per hour, while the minimum wage in Pennsylvania stayed at $4.25 per hour. Energetic students collected data on 410 fast food restaurants in New Jersey (the treatment group) and eastern Pennsylvania (the control group). The "before" period is February 1992, and the "after" period is November 1992. Using these data, we will estimate the effect of the "treatment," raising the New Jersey minimum wage on employment at fast food restaurants in New Jersey. It is easier and more general to use the regression format to compute the differences-in- differences estimate using sample means. Let Y = FTE , the treatment variable is the indicator variable NJ = 1 if observation is from New Jersey, and zero if from Pennsylvania. The time indicator is D = 1 if the observation is from November and zero if it is from February. after before (a) Using the 794 complete observations in file njmin3.dat, to compute descriptive statistics and fill the table: Variable N mean se Pennsylvania (PA) Before After New Jersey (NJ) Before After (b) Their interested in the estimate of change in employment due to the change in minimum wage. Write out the null hypotheses and alternative hypotheses: using o notation. (c) Use above table to calculate o (8 represents the differences-in-differences estimate of change in employment due to the change in minimum wage) (d) Write out the differences-in-differences regression equation with eit. (e) Estimate the o based on the above regression and conduct the hypothesis test. FTE = 0.5 x number of part time workers + number of fulltime workers + number of managers