Reading proficiency: An educator wants to construct a 99.8% confidence interval for the proportion of elementary school children in Colorado who are proficient in reading. Part: 0/3 Part 1 of 3 (a) The results of a recent statewide test suggested that the proportion is 0.77. Using this estimate, what sample size is needed so that the confidence interval will have a margin of error of 0.057 A sample of elementary school children is needed to obtain a 99.8% confidence interval with a margin of error of 0.05.

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