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Chapter 8: Q. 9.88 (page 381)

Worker Fatigue. A study by M. Chen et al. titled "Heat Stress evaluation and Worker Fatigue in a Steel Plant" (American Industrial Hygiene Association, Vol. 64, pp. 352-359) assessed fatigue in steel plant workers due to heat stress. A random sample of 29 casting workers had a mean post-work heart rate of 78.3 beats per minute (bpm). At the 5% significance level, do the data provide sufficient evidence to conclude that the mean post-work heart rate for casting workers exceeds the normal resting heart rate of 72 bpm? Assume that the Population Standard deviation of post-work heart rate for casting workers is 11.2 bpm.

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