A consumer group is interested in comparing operating costs for two different types of automobile engines. The
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A consumer group is interested in comparing operating costs for two different types of automobile engines. The group is able to find 15 owners whose cars have engine type A and 15 who have engine type B. All 30 owners bought their cars at roughly the same time and all have kept good records for a certain 12 month period. In addition, owners were found that drove roughly the same mileage. The cost statistics are yA = $87.00/1,000 miles, yB = $75.00/1,000 miles, SA = $5.99, and SB — $4.85. Compute a 95% confidence interval to estimate μA — μB, the difference in the mean operating costs. Assume normality and equal variance.
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n nB 15 A 87 8A 599 JB 75 SB 485 sp 5450 and to025 ...View the full answer
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