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A stress researcher believes that people with high-stress jobs tend to sleep less than people with...

A stress researcher believes that people with high-stress jobs tend to sleep less than people with low-stress jobs, even if they are in bed for the same amount of time each night. From previous studies, it is known that the average person sleeps for 7.2 hours each night and the standard deviation is about 0.8 hours. The researchers decides to sample 40 people with high stress jobs and finds that they sleep an average of 6.9 hours each night. Using a .02 significance level, is there sufficient evidence that high-stress jobs causes people to get less sleep?

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