Question: Groton Boat Supply has received shipments of 15 000 pressurized cans

Groton Boat Supply has received shipments of 15,000 pressurized cans of fiberglass sealant from each of its two main suppliers, Alcott Industries and Brookside, Inc. Inspectors at Groton take a simple random sample of 150 of the cans from the Alcott shipment and find that 15 are under pressurized. For a similar sample of 150 components from the Brookside shipment, nine of the cans are under pressurized. Construct and interpret the appropriate 95% confidence interval estimate of the overall difference in the proportion of under pressurized cans for the two shipments.



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  • CreatedJuly 16, 2015
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