A quality control expert wants to estimate the proportion of defective components that are being manufactured by his company. A sample of 300 components showed
A quality control expert wants to estimate the proportion of defective components that are being manufactured by his company. A sample of 300 components showed that 20 were defective. How large a sample is needed to estimate the true proportion of defective components to within 2.5 percentage points with 99% condence? (9 663 O 540 O 2663 06
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