SOLUTION: Minimum sample size you should use to assure that your estimate of ^p will be within the required margin of the population p. Margin of error: 0.04; confidence level: 90%; from

Question 1061352: Minimum sample size you should use to assure that your estimate of ^p will be within the required margin of the population p.
Margin of error: 0.04; confidence level: 90%; from a prior study, ^p is estimated by 0.27. Let z=1.645
A) 13
B) 334
C) 296
D) none of these
E) 1002
Answer by MathTherapy(10557) (Show Source): You can put this solution on YOUR website!

Minimum sample size you should use to assure that your estimate of ^p will be within the required margin of the population p.
Margin of error: 0.04; confidence level: 90%; from a prior study, ^p is estimated by 0.27. Let z=1.645
A) 13
B) 334
C) 296
D) none of these
E) 1002

Both z = 1.645, and confidence level: 90% are not needed. Just 1 is fine.

With estimated proportion, or p̂ being 0.27, sample size for the proportion, or:  

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