Author Question: To compare the effectiveness of two kinds of bumper guards, two independent random samples of six ... (Read 35 times)

Ale · **on:** Feb 26, 2023

To compare the effectiveness of two kinds of bumper guards, two independent random samples of six compact cars were outfitted with one of the two guards (6 cars with type 1 and 6 cars with type 2). Then, each car was run into a concrete wall at 5 mph. The average damage estimate for guard 1 was $1440. We know that the population variance of damage using bumper type 1 is 3632. The guard 2 sample had an average damage estimate of $1490. We know that the population variance of damage using bumper type 2 is 2020. Assuming both populations are normally distributed, construct a 90% confidence interval on the difference in mean repair cost.

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(–100.49, 0.49)

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(–89.33, –10.67)

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(–110.16, 10.16)

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(–129.06, 29.06)

ladan86 · **Reply #1 on:** Feb 26, 2023

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