12.3 Using samples of 200 observations each, a quality inspector found the results shown in Table EX 12.3. Table EX 12.3 Sample 123456 Number of Defectives 4 2 5865 a. Determine the fraction defective in each sample. b. Estimate the mean and standard deviation of the sampling distribution of fractions defective. c. Determine the control limits that would give an alpha risk of 0.025 for this process. d. Construct an appropriate control chart and identify any observations that are not within control limits.

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