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A Manufacturer Receives Parts from Two Suppliers

Question 42

Multiple Choice

A manufacturer receives parts from two suppliers.A simple random sample of 400 parts from Supplier 1 finds 20 defective.A simple random sample of 200 parts from Supplier 2 finds 20 defective.Let p1 and p2 be the proportion of all parts from Supplier 1 and Supplier 2,respectively,that are defective.What is the estimate for the difference in proportions,p1 - p2?


A) -0.05
B) 0.05
C) 0.067
D) 0.10

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