Hypotheses Testing (Single Sample) : Solved Example #4

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These questions are taken from the book 'Probability and Statistics for Engineering and the Sciences' by Jay L. Devore (8th Edition)

Question : A well-designed and safe workplace can contribute greatly to increased productivity. It is especially important that workers not be asked to perform tasks, such as lifting, that exceed their capabilities. The accompanying data on maximum weight of lift (MAWL, in kg) for a frequency of four liftsimin was reported in the article “The Effects of Speed, Frequency, and Load on Measured Hand Forces for a Floor-to-Knuckle Lifting Task” (Ergonomics, 1992: 833-843); subjects were randomly selected from the population of healthy males ages 18-30. Assuming that MAWL is normally distributed, does the data suggest that the population mean MAWL exceeds 25 ? Carry out a test using a significance level of .05 .

25.8 36.6 26.3 21.8 27.2

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