A manufacturer of electronic calculators is interested in estimating the fraction of defective units produced. A random sample of 800 calculators contains 10 defectives. Compute a 95% confidence interval for the proportion of defective calculators.
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2. A manufacturer of electronic calculators is interested in estimating the proportion of defective units produced. A random sample of 800 calculators contains 10 defective. (a) Give a point estimate for the proportion of defective units. (b) Compute a 99% (two-sided) confidence interval for the proportion of defective units. (c) Suppose we want a 95% confidence interval with error not exceeding 0.005. How big a sample do you need to achieve this accuracy?
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