Question

Exercise 4. A different analysis of the sleep problem
In a class survey, students are asked how many hours they sleep per night. In the random sample of 18 students, the (sample) mean is 6.8 hours with a (sample) standard deviation of 1.9 hours. We wish to know if this shows that the class’s student population on average has gotten a different amount of sleep from the recommended 8 hours of sleep at the α = .01 level. The distribution of sleep for this population follows a normal distribution.

g) Separately, find the 98% confidence interval of average sleep for this class. Provide the upper bound with the answer rounded to 2 decimal places.

Answer 1