An epidemiologist wants to estimate the proportion of residents in her city that carry the Hepatatis A virus. It is thought that the proportion is approximately 61%. How large a sample of residents should be taken to estimate the proportion who carry the Hepatitis A virus to within 5 percentage points with 90% confidence? In your calculation, please use the critical value rounded to 3 decimal places. Hint: Make sure that you round up to the next integer.

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