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 30 were defective.  How large a sample is needed to estimate the true proportion of defective components to within 2.5 percentage points with 95% confidence?

MATLAB: An Introduction with Applications
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Author:Amos Gilat
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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 30 were defective.  How large a sample is needed to estimate the true proportion of defective components to within 2.5 percentage points with 95% confidence? 

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It is given that a sample of 300 components showed that 30 were defective.

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