Chpt 10 HW

Using samples of 200 credit card statements, an auditor found the following: Use Table-A Click here for the Excel Data File a. Determine the fraction defective in each sample. (Round your answers to 3 decimal places.) Answer is complete and correct. b. If the true fraction defective for this process is unknown, what is your estimate of it? (Round your answer to 1 decimal place.) Answer is complete and correct. 2.50% c. What is your estimate of the mean and standard deviation of the sampling distribution of fractions defective for samples of this size? (Do not round intermediate calculations. Round your answers to 3 decimal places.) d. What control limits would give an alpha risk of 03 for this process? (Do not round intermediate calculations. Round your " z value to 2 decimal places and other answers to 4 decimal places.) Answer is complete but not entirely correct. e. What alpha risk would control limits of 047 and .003 provide? (Do not round intermediate calcuiations. Round your " z " value to the nearest whole number and "alpha risk" value to 4 decimal places.) Answer is complete but not entirely correct. f. Using control limits of .047 and .003 , is the process in control? The process is in control. The process is not in control. 9. Suppose that the long-term fraction defective of the process is known to be 2 percent. What are the values of the mean and standard deviation of the sampling distribution? (Do not round intermediate calculations. Round your answers to 2 decimal places.) h. Construct a control chart for the process, assuming a fraction defective of 2 percent, using two-sigma control limits. Is the process in control? The process is in control. The process is not in control