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Check the accuracy of a new computerized billing system. A manager takes a random sample of n = 350 bills and checks for errors. It

Check the accuracy of a new computerized billing system. A manager takes a random sample of n = 350 bills and checks for errors. It was found that 22 of the bills contained at least one error. a. Calculate and interpret a 90% confidence interval for the true proportion of bills that contain at least one error. b. Use R for the calculations

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