The state education commission wants to estimate the proportion of tenth-grade students that have reading skills at or below the eighth-grade level. How large a sample would be required to estimate the proportion of tenth graders reading at or below the eighth-grade level using 90% confidence level with a margin of error of 0.05 if: a)p = 0.10 from an earlier study b)no estimate of p is available

MATLAB: An Introduction with Applications
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The state education commission wants to estimate the proportion of tenth-grade students that have reading skills at or below the eighth-grade level. How large a sample would be required to estimate the proportion of tenth graders reading at or below the eighth-grade level using 90% confidence level with a margin of error of 0.05 if:

a)p = 0.10 from an earlier study

b)no estimate of p is available

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