Question

Question 5 (7 marks) Dr. Cooper, a professor of management, is studying the relationship between work schedules and family life. In a sample of 120 people who worked the night shift only he found the following: a. The mean weekly amount of time (in hours) they spent caring for their children was 27.2 hours, with a standard deviation of 10.3 hours. Determine a 95% confidence interval for the mean number of hours spent caring for their children. b. A total of 18 indicated that their parents had also worked the night shift. What is the 90 percent confidence interval for the proportion of workers whose parents also worked nights? c. Suppose you want your estimate of the population proportion to be within +0.03, with a 95 percent level of confidence, how large a sample is required to estimate the proportion of workers whose parents also worked nights?

Answer 1

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