Question

A quality control inspector wants to test that the proportion of defective items in three shipments of components from different manufacturers is equal. A random sample of 125 items is selected from each shipment. The first sample has 36 defective items, the second has 30, and the third has 38. Test to see whether there is evidence of a difference in proportions of defective items, with α = 0.05.


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  • CreatedJuly 12, 2015
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