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

Two different types of injection-molding machines are used to form plastic parts. A part 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 12 defective parts are found in the sample from machine 2. Construct a 95% confidence interval on the difference in the two fractions defective ( p 1 – p 2) .

Round your answers to 4 decimal places.

The 95% confidence is

Math   Statistics-And-Probability   
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