SOLUTION: A pilot study shows that 64% of people living in the downtown core are single. A market research company wants to verify this claim. The company requires a 95% confidence interval.

Question 1162081: A pilot study shows that 64% of people living in the downtown core are single. A market research company wants to verify this claim. The company requires a 95% confidence interval. How many residents should be interviewed to keep the margin of error within 0.02 of the population proportion?
Answer by Boreal(15235) (Show Source): You can put this solution on YOUR website!
the half-interval or the margin of error=0.02=z*sqrt(0.64*0.36/n), z=1.96
square both sides
0.0004=3.8416*0.64*0.36/n
n=3.8416*0.64*0.36/).0004
=2212.76 or 2213

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