The cost of auto insurance varies by coverage, location, and the driving record of the driver. The following are estimates of the annual cost for standard coverage as of January 1, 2011 for a male driver with 6-8 years of experience, driving a Honda Accord with no accidents or violations.3 (These are quotes and not premiums.)

a. What type of design was used in collecting these data?
b. Is there sufficient evidence to indicate that insurance premiums for the same type of coverage differs from company to company?
c. Is there sufficient evidence to indicate that insurance premiums vary from location to location?
d. Use Tukey's procedure to determine which insurance companies listed here differ from others in the premiums they charge for this typical client. Use a = .05.

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Fireman's State Location Century Geico AAA FundFarm 21st West Hollywood 3922 4073 3663 4075 3876 Laguna Beach 2378 2512 2478 3056 2508 2476 2549 2756 2614 2584 2759 2494 2940 2714 Redlands Riverside 2560