# Find the minimum sample size to find the 90% interval estimate for a population proportion if you want to be accurate to 4%

Find the minimum sample size to find the 90% interval estimate for a population proportion if you want to be accurate to 4%.

**Solution: **First, we have the 90% confidence Margin of Error is given by

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We want the estimate for a population proportion to be accurate within 4%, which is equivalent to have

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The sample size should be at least 601.

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