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Two different types of injection-molding machines are used to form plastic bottle. A bottle is considered...

Two different types of injection-molding machines are used to form plastic bottle. A bottle is considered defective if it has excessive shrinkage or is discolored. Two random samples, each of size 300, are selected, and 15 defective parts are found in the sample from machine 1 while 8 defective parts are found in the sample from machine 2. (a) Is it reasonable to conclude that both machines produce the same fraction of defective parts? Use ?? = 0.05 [10 points] (b) Construct a 99% confidence interval on the difference in the two fractions defective. [5 points]

Math   Statistics-And-Probability   
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