SOLUTION: Nearly one-half of Americans aged 25 to 29 are unmarried. How large a sample is necessary to estimate the true proportion of unmarried Americans in this age group within 2 1/2 perc

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Question 1055447: Nearly one-half of Americans aged 25 to 29 are unmarried. How large a sample is necessary to estimate the true proportion of unmarried Americans in this age group within 2 1/2 percentage points with 90% confidence?
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Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!
ME = z%2Asqrt%28%28p%281-p%29%29%2Fn%29
0r
n = %28z%2FME%29%5E2+%28p%281-p%29%29%29
n = %281.645%2F.025%29%5E2+%28.5%28.5%29%29 round Up to nearest whole number
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= CI z = value
90% z =1.645
92% z = 1.751
95% z = 1.96
98% z = 2.326
99% z = 2.576