Worker Fatigue. Refer to Exercise 9.20. Explain what each of the following would mean.

a. Type I error

b. Type II error

c. Correct decision 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

d. equals the normal resting heart rate of 72 bpm.

e. exceeds the normal resting heart rate of 72 bpm.