A random sample of 15 automobile mechanics certified towork on a certain type of car was

Chapter 15, Problem 4

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A random sample of 15 automobile mechanics certified towork on a certain type of car was selected, and the time (inminutes) necessary for each one to diagnose a particularproblem was determined, resulting in the following data:30.6 30.1 15.6 26.7 27.1 25.4 35.0 30.831.9 53.2 12.5 23.2 8.8 24.9 30.2Use the Wilcoxon test at significance level .10 to decidewhether the data suggests that true average diagnostic time isless than 30 minutes.

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