Reading proficiency: An educator wants to construct an 80% confidence interval for the proportion of elementary school c

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Reading proficiency: An educator wants to
construct an
80%
confidence interval for the proportion of elementary
school children in Colorado who are proficient in reading.
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Part 1 of 3
(a) The results of a recent statewide test suggested that the
proportion is
0.73
. Using this estimate, what sample size is needed so that the
confidence interval will have a margin of error of
0.05
?
80%
0.05