Suppose 40 Professional Employees Are Randomly Selected

question 27

Multiple Choice

Suppose 40 professional employees are randomly selected. This sample yields a mean of 15.2 hours and a standard deviation of 1.8 hours. The 95% confidence interval is

• A) 12.45 to 17.85 hours.
• B) 14.62 to 15.78 hours.
• C) 13.88 to 14.29 hours.
• D) 10.65 to 20.22 hours.
• E) 11.98 to 18.02 hours.