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Based on a random sample of 600 families in a city, we found 396 of them have at least one child. a) Construct a 77% confidence interval on the percentage of families in the city which have at least one child and give the confidence statement. b) With a 92% confidence, suppose we wish to control the confidence interval to be within 1% of the population proportion. What is the minimum sample size that we need to use to achieve this?
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