Exercise: Mann-Whitney Test
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1. Question
Data File: Mann-Whitney.MTW
Situation:
A state highway department uses two brands of paint for painting stripes on roads. A highway official wants to know whether there’s a difference in the durability of the two brands of paint. For each paint type, the official researches and records the number of months the paint persists on the highway.
Use the data in the “Mann-Whitney.MTW” data file to perform a test to determine whether the median number of months the paint persists differs between the two brands.
Question:
Is there a statistical difference between the number of months that paint from two different brands persists on the road?
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