Question: Consider the following dataset

City Turnover Violations

St. Louis 416 11.9

Atlanta 375 7.3

Houston 237 10.6

Boston 207 22.9

Chicago 200 6.5

Denver 193 15.2

Dallas 156 18.2

Baltimore 155 21.7

Seattle/Tacoma 140 31.5

San Francisco 110 20.7

Orlando 100 9.9

Washington-Dulles 90 14.8

Los Angeles 88 25.1

Detroit 79 13.5

San Juan 70 10.3

Miami 64 13.1

New York-JFK 53 30.1

Washington-Reagan 47 31.8

Honolulu 37 14.9

a) Compute the variance?

b) Compute the coefficient of correlation?

c) What conclusions can you reach about the relationship between the turnover rate of pre-boarding screeners and the security violations detected?