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jccruz jccruz
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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.


▸

(–100.49, 0.49)



▸

(–89.33, –10.67)



▸

(–110.16, 10.16)



▸

(–129.06, 29.06)

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Introductory Statistics: A Problem-Solving Approach

Introductory Statistics: A Problem-Solving Approach


Edition: 3rd
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wonton1wonton1
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jccruz Author
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2 years ago
Thanks for your help!!
dedricgard
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Yesterday
This helped my grade so much Perfect
lubennick
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2 hours ago
Good timing, thanks!
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