QUESTION 16 Spoints SaveAnswer Employees in a company experience distractions (phone calls, emails, unscheduled visits "etc".) during their ofce hours. Given that the distraction times are right skewed with a mean of 95 minutes and a standard deviation of 18 minutes. What is the probability that for a random sample of 9 employees their mean distraction time is more than 105 minutes? Not enough information. 0.2893 0.7257 0.9522 QUESTION 17 Spoints SaveAnswer How would a 99% z-interval compare to a 99% t-interval? Both intervals are identical. The Zinterval would be wider than the t-interval. The middle of the zinterval is greater than the middle of the tinterval. The z-interval would be narrower than the t-interval. QUESTION 18 3points SaveAnswer The standard error of the sample mean is never larger than the standard deviation of the population. All of the options are correct. measures the variability of the mean from sample to sample. decreases as the sample size increases. QUESTION 19 The monthly salaries of employees of a construction company is normally distributed and averaged at AED 16,000 with a standard deviation of AED 2500. Find the minimum and the maximum salaries symmetrically distributed around the population mean, that will include 85% of the sample means X , based on samples of 25 employees. Round your answer to the nearest dirham. QUESTION 20 At the local car shop, the amount of time required for an oil and lter change on an automobile is normally distributed. A random sample of 25 cars is selected yields a mean of 41 minutes and a standard deviation of 9.83 minutes. What is the margin of error for computing the 96% condence interval for the populaton mean time? Round your answer to three decimal places. QUESTION 21 The monthly rents for studio apartments in Abu Dhabi have a mean of AED 3450 and a standard deviation of AED 900. Random samples of size 36 are drawn from the population. Find the mean and standard error of the mean monthly rents for studio apartments. QUESTION 22 Which of the following would produce the narrowest confidence interval for u? 93% condence interval with n = 200. 90% condence interval with n = 200. 90% condence interval with n = 100. 93% condence interval with n = 100. 3 points 4 points a points 3 points Save Answer Save Answer Save Answer Save