1) Edgar, a manager from Human Resources, thinks the problem stems from night-shift workers not getting...

1) Edgar, a manager from Human Resources, thinks the problem stems from night-shift workers not getting proper sleep and consequently inducing errors. He thinks that less than 50% of workers on the night shift are getting at least the seven hours of sleep necessary to perform adequately. HR surveys 80 night-shift workers and finds that 46 of them claim to get at least seven hours of sleep per night. At 95% confidence, can we reject Edgar’s claim? Please use the critical-value method to test this, stating the null and alternative hypotheses as well as the test statistic you will use.

- Lisa, another HR manager, thinks that the problems have nothing to do with the night shift, so she wants to prove to Edgar that the proportion of day-shift workers getting adequate sleep and night-shift workers getting adequate sleep is the same. She interviews 50 day-shift workers and finds that 31 claim to get at least seven hours of sleep per night. Using the surveys for night-shift workers from problem 2, can we say that Lisa is wrong with 95% confidence? In your answer, please use the critical-value method, stating the null and alternative hypotheses as well as the test statistic you will use.

Expert Solution

orchestra answered 1 year ago

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