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A store manufactures a part that is used in making Hard drives, each one is tested prior to shipment to determine whether or not the

A store manufactures a part that is used in making Hard drives, each one is tested prior to shipment to determine whether or not the hard drive works or not. In a random sample of 300 Hard drives, 12 Hard drives were found to not work

Estimate with a 99% confidence, the true proportion of the not working parts that is made by the store.

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