a machine is known to produce 20% defective products and is therefore sent for repair. after the machine is repaired the manager of the factory wants to ensure that the machine is functioning properly. 400 products produced by the machine are chosen at random and 64 of them are found to be defective.?

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Question Background A machine is known to produce 20% defective products and is therefore sent for repair. After the machine is repaired 400 products produced by the machine are chosen at random and 64 of them are found to be defective. Do the data provide enough evidence that the proportion of defective products produced by the machine (p ...