QUESTION 2 - JDB TRAINING PRUGRAH IH NEH HAMPSHIRE AND MASSACHHSETTS In 293E, a job training program was offered free of charge to unemployed workers in Maine and vermont. The program was not offered in New Hampshire and Massachusetts. Unemployment data from before and after this program was run are below: New Hampshire and Massachusetts in EBB? WEWE in 2939 {a} Using a difference-in-differences {DD} estimator, estimate the effect of the job training program on the unemployment level in Maine and Vermont. Hhat assumption{s} need to hold for this estimate to be unbiased? Hake sure to refer to the concept of \"counterfactual\" in your explanation. {o} A critic argues that your DD estimate is biased because you did not account for the recession in 1333, and this recession clearly had an effect on unemployment rates. Comment on the validity of this criticism: Explain under which conditions it would be valid and under which conditions it would not be valid. {c} Assume that the assumptions} from {a} do hold. l[or-lent on the extent to which you think the estimate you found in {a} would apply to other states in other years. Hhat factors need to he considered to assess the estimates external validity