Question

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 feet, but not on a control group. At the end of a trial period, accident data showed 12 repair incidents for the experimental group and 9 repair incidents for the control group. The vehicle downtime (in days) per repair incident is shown. Research question: At α = .05, do the medians differ? (Data are Downtime from Floyd G. Willoughby and Thomas W. Lauer, confidential case study.)


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  • CreatedAugust 19, 2015
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