Confidence interval for a population proportion
Find the lower end point of a 95% confidence interval for a population proportion based on a sample size of 100 if the sample proportion is 0.4. Give your answer to 2 decimal places.
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What is minimum sample size required to estimate a mean within 2 with 95% confidence if the sample standard deviation is 20?
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Find the minimum sample size required to estimate a population proportion to within 0.05 with 95% confidence.
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