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A quality-conscious disk manufacturer wishes to know the fraction of disks his company makes which are...

A quality-conscious disk manufacturer wishes to know the fraction of disks his company makes which are defective.

Step 2 of 2 :  

Suppose a sample of 6492 floppy disks is drawn. Of these disks, 779 were defective. Using the data, construct the 99% confidence interval for the population proportion of disks which are defective. Round your answers to three decimal places. previous answer was .120

Math   Statistics-And-Probability   
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Answer #1

Refer Standard normal table/Z-table or use excel function "=NORM.S.INV((1-0.005))" to find the Z-value.


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