INFERENCE FOR SINGLE POPULATION PROPORTION (CONFIDENCE INTERVAL) A random sample of 400 electronic components manufactured by a certain process is tested, and 30 are found to be defective. 11. i. Let p be the proportion of defective components. Find a 95% confidence interval for p. ii. How many components must be sampled so that the 95% confidence interval will specify the proportion of defective components to within +0.02? Source: Statistics for Engineers and Scientists, 3rd Edition, William, C. Navidi.

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