More than 100 million people around the world are not getting enough sleep; the average adult needs between 7.5 and 8 hours of sleep per night. College students are particularly at risk of not getting enough shut-eye. A recent survey of several thousand college students indicated that the total hours of sleep time per night, denoted by the random variable X, can be approximated by a normal model with E(X) = 6.62 hours and SD(X) = 1.13 hours. Question 1. Find the probability that the hours of sleep per night for a random sample of 4 college students has a mean x between 6.57 and 6.93. (use 4 decimal places in your answer) Question 2. Find the probability that the hours of sleep per night for a random sample of 16 college students has a mean x between 6.57 and 6.93. (use 4 decimal places in your answer) Question 3. Find the probability that the hours of sleep per night for a random sample of 25 college students has a mean x between 6.57 and 6.93. (use 4 decimal places in your answer)
More than 100 million people around the world are not getting enough sleep; the average adult needs between 7.5 and 8 hours of sleep per night. College students are particularly at risk of not getting enough shut-eye.
A recent survey of several thousand college students indicated that the total hours of sleep time per night, denoted by the random variable X, can be approximated by a normal model with E(X) = 6.62 hours and SD(X) = 1.13 hours.
Question 1. Find the probability that the hours of sleep per night for a random sample of 4 college students has a mean x between 6.57 and 6.93.
(use 4 decimal places in your answer)
Question 2. Find the probability that the hours of sleep per night for a random sample of 16 college students has a mean x between 6.57 and 6.93.
(use 4 decimal places in your answer)
Question 3. Find the probability that the hours of sleep per night for a random sample of 25 college students has a mean x between 6.57 and 6.93.
(use 4 decimal places in your answer)
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