In: Statistics and Probability
Twenty-five samples of 100 items each were inspected when a process was considered to be operating satisfactorily. In the 25 samples, a total of 155 items were found to be defective.
(a)What is an estimate of the proportion defective when the process is in control?
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(b)What is the standard error of the proportion if samples of size 100 will be used for statistical process control? (Round your answer to four decimal places.)
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(c)Compute the upper and lower control limits for the control chart. (Round your answers to four decimal places.)
UCL=
LCL=