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Find the minimal size based on margin of error

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A researcher wishes to estimate with 90% confidence, with percentage of adults wishing to abolish pennies. Estimate must be accurate within 2% of true proportion.
Find the minimum sample size needed using study that found 26% respondents that support abolishing pennies.

(a) Find minimum sample size needed
(b) No preliminary estimate is available, find the minimum sample size needed

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The solution provides detailed explanation how to find out the minimal size based on margin of error.

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First, the critical value for 90% confidence interval is 1.645 (it is the z value that corresponding the value of ...

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