The Better Business Bureau suspects that High-Cost Gas Station is consistently charging higher prices for repairs than other garages. The BBB sent 10 cars to High-Cost for an estimate of repair costs. Then, it sent the same 10 cars to Expressway Gas Station. The results are reported here.

Can you argue that High-Cost Gas Station is charging higher prices than Expressway? Do a 10 percent test.

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Car 1 2 High-Cost $678 784 Expressway $579 321