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Construct a confidence interval of the mean of differences

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Reference no: EM131097385

Car Repair Costs

Assume that the paired sample data are simple random samples and that the differences have a distribution that is approximately normal.
Car Repair Costs

Listed below are the costs (in dollars) of repairing the front ends and rear ends of different cars when they were damaged in controlled low-speed crash tests (based on data from the Insurance Institute for Highway Safety). The cars are Toyota, Mazda, Volvo, Saturn, Subaru, Hyundai, Honda, Volkswagen, and Nissan. Construct a 95% confidence interval of the mean of the differences between front repair costs and rear repair costs. Is there a difference?

Front repair cost

936

978

2252

1032

3911

4312

3469

2598

4535

Rear repair cost

1480

1202

802

3191

1122

739

2769

3375

1787

Reference no: EM131097385

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