13) a journalism major is tracking the number of protests between san francisco and new york. he randomly selects 100 days and find the number of protests in each city on each of those days. the average in new york was 2.4 protests, the average in san francisco was 0.7 protests. the standard deviation in new york was 2.3 while in san francisco it was 5.7 and the standard deviation of the differences was 1.2 protests. his goal is to find with 80% confidence what the average difference is in the number of protests between the two cities.
