If n=210 and ˆpp^ (p-hat) =0.74, find the margin of error at a
90% confidence level
Give your answer to three decimals
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Solution :
Given that,
Point estimate = sample proportion = = 0.74
Z/2 = 1.645
Margin of error = E = Z / 2 * (( * (1 - )) / n)
= 1.645 * (((0.74 * 0.26) / 210)
= 0.050
Margin of error = E = 0.050
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