Question: 19. A quality analyst wants to construct a control chart for determining whether four machines, all producing the same product, are in control with regard

19.

A quality analyst wants to construct a control chart for determining whether four machines, all producing the same product, are in control with regard to a particular quality attribute. Accordingly, she inspected 1,000 units of output from each machine in random samples, with the following results

Machine Total Defectives
#1 23
#2 15
#3 29
#4 13

What is the estimate of the standard deviation of the sampling distribution of sample proportions for this process?

.04

.00002

.0044

.00016

.016

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