# Statistics: Experimental car bumper and repair incidents

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An experimental bumper was designed to reduce damage in low-speed collisions. This bumper was installed on an experimental group of vans in a large fleet, but not on a control group. At the end of a trial period, there were 12 repair incidents (a "repair incident" is an accident that resulted in a repair invoice) for the experimental group and 9 repair incidents for the control group. The dollar cost per repair incident is shown below.

(a) Use MegaStat or MINITAB to perform a two-tailed Mann-Whitney test at α = .05.

(b) Perform a one-tailed parametric t test for two independent sample means by using Excel or MegaStat. Do you get the same decision? (Data are from Floyd G. Willoughby and Thomas W. Lauer, confidential case study.)

Damage

Old bumper: 1,185, 885, 2,955, 815, 2,852, 1,217, 1,762, 2,592, 1,632

New bumper: 1,973, 403, 509, 2,103, 1,153, 292, 1,916, 1,602, 1,559, 547, 801, 359

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The expert examines the experimental car bumper and repair incidents.

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Mann-Whitney

An experimental bumper was designed to reduce damage in low-speed collisions. This bumper was installed on an experimental group of vans in a large fleet, but not on a control group. At the end of a trial period, there were 12 repair incidents (a "repair incident" is an accident that

resulted in a repair invoice) for the experimental group and 9 repair incidents for the control group. The dollar cost per repair incident is shown below. (a) Use MegaStat or MINITAB to perform a two-tailed Mann-Whitney test at α = .05. (b) Perform a one-tailed parametric t test for two independent sample means by using Excel or MegaStat. Do you get the same decision? (Data are from Floyd G. Willoughby and Thomas W. Lauer, confidential case study.)

Damage

Old ...

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