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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 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 |
For upper and lower control limits of .026 and .014, which machine(s), if any, appear(s) to be out-of-control for process proportion of defectives?
Multiple Choice
machines #2 and #3
none of the machines
machine #4
machines #3 and #4
machine #3
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