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QUESTION 2 In which of the following situations we can not construct a confidence interval for the population proportion p? x=196 and n=200. x=11 and n= 38. x=10 and n=74. x=174 and n=260. QUESTION 3 A recent study of over 1000 parents on cyberbullying showed that a 95% confidence interval of proportion of kids who faced bullying in social media sites and apps is (0.124, 0.198). Find the point estimator of the population proportion of kids who faced bullying in social media sites and apps. Round your answer to three decimal places. QUESTION 4 The waiting time (in minutes) of customers at a fast food outlet is right-skewed. A random sample of 36 customers is selected and the 99% confidence interval for the population mean waiting time is obtained as (1.82,2.57). Find the standard deviation used to construct the 99% confidence interval. Round your anser to three decimal places. QUESTION 11 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 12 Employees in a company experience distractions (phone calls, emails, unscheduled visits etc.) during their office 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 36 employees their mean distraction time is more than 85 minutes? 0.9996 0 0.2893 0 0.0478 0.7107 QUESTION 13 A random sample of 36 light bulbs had a mean lifetime of 590 hours. A 95% confidence interval for the population mean was (580,600). Which one of the following statements is the correct interpretation of the results? We are 95% confident that the interval (580,600) contains the true mean lifetime. None of these are true. With probability 95%, the confidence interval (580,600) contains the true mean lifetime. Of all the bulbs 95% of the light bulbs in the sample had lifetimes between 580 hours and 600 hours. QUESTION 14 Find the confidence level related to the critical value za/2=1.723. 89.2% 0 91.5% 88.4% 96.5% QUESTION 15 Which of the following would produce the narrowest confidence interval for u? 90% confidence interval with n = 200. 93% confidence interval with n = 100. 93% confidence interval with n = 200. 90% confidence interval with n = 100. QUESTION 16 The standard error of the sample mean All of the options are correct. measures the variability of the mean from sample to sample. is never larger than the standard deviation of the population. decreases as the sample size increases