The expected value is a. the product of the sums of the probability and the values in different states b. the sum of the products of the probability and the values in different states c.the difference between the products of the probability and the values in different states d. the difference between the sums of the probability and the values in different states
You want to run a difference-in-difference experiment with a price increase for your lawn chairs in Miami. If you are worried about "leakage" with your control group, a poor comparison city would be a. Boston b. San Francisco c. St. Paul d. Tampa Bay