5. A random sample of students across the UC system are asking how many hours they think they spend flying each year within the United States. 22 students were asked who had an average of 18.4 hours each year. The researchers who conducted the study said they were 95% confident that the average hours flown nationally each year by students in the UC system was within the interval (16.937, 19.863) hours.
(a) Considering the information that you have been given, what was the sample standard deviation of the number of hours that the families in the sample spent on the beach each week? Give your answer to 1 decimal place.
(b) A similar study was conducted on 29 students from the University of West Virginia. They were asked the same question, the number of hours they usually spend on domestic flights each year. The mean number of hours from this sample was 5.2 hours and the sample standard deviation was 0.6. What is a 95% confidence interval for the average hours spent on domestic flights from students at the University of West Virginia.