Worker Fatigue. A study by M. Chen et al. Titles \"Heat Stress Evaluation and Wo

Question

Worker Fatigue. A study by M. Chen et al. Titles "Heat Stress Evaluation and Worker Fatigue in a Steel plan" (American Industrial Hygiene Association, Vol. 64, pp. 352-359) assessed fatigue in steel-plant workers due to heat stress. Among other things, the researchers monitored the heart rates of a random sample of 29 casting workers. A hypothesis test is to be conducted to decide whether the mean post-work heart rate of casting workers exceeds the normal resting heart rate of 72 beats per minute (bpm). Now suppose that the results of carrying out the hypothesis test lead to rejection of the null hypothesis. Classify that conclusion by error type or as a correct decision if in fact the mean post-work heart rate of casting workers equals the normal resting heart rate of 72 bpm. exceeds the normal resting heart rate of 72 bpm.

Explanation / Answer

The test results in rejection of the null hypothesis.

d. equals the normal resting heart rate of 72 bpm.-Type-1 error= True H0 but reject it (False Positive)

e. Exceeds the normal resting heart rate of 72 bpm- correct decision to reject the null.

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