The question is from Intermediate Statistics. Hope I can get a correct and detailed response.

_____ Question 1. The cost of automobile insurance has become a sore subject in California because the rates are dependent on so many variables, such as the city in which you live1 the number of cars you insure, and the company with which you are insured. Here are the 6-month premiums in 2004 for a single male, licensed for 6 to 8 years, who drives about 15000 miles per year and has no violations or accidents. City Allstate 21st Century Long Beach $884 $996 Pomona 730 940 San Bernardino 725 836 Moreno Valley 801 762 1. Why would you expect these pairs of observations to be dependent