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Reading proficiency: An educator wants to construct a 99.5% confidence interval for the proportion of elementary school children in Colorado who are proficient in reading.
Reading proficiency: An educator wants to construct a
99.5%
confidence interval for the proportion of elementary school children in Colorado who are proficient in reading.
Part: 0 / 3
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Part 1 of 3
(a) The results of a recent statewide test suggested that the proportion is
0.69
. Using this estimate, what sample size is needed so that the confidence interval will have a margin of error of
0.03
?
A sample of elementary school children is needed to obtain a 99.5% confidence interval with a margin of error of 0.03 . |
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