SOLUTION: Which statement is incorrect? Explain. a. If p = 0.50 and n = 100, the estimated standard error of the sample proportion is 0.05. [2] b. In a sample size calculation for estimati

Question 1175553: Which statement is incorrect? Explain.
a. If p = 0.50 and n = 100, the estimated standard error of the sample proportion is 0.05. [2]
b. In a sample size calculation for estimating π, it is conservative to assume π = 0.50. [2]
c. If n = 250 and p = 0.07 it is not safe to assume normality in a confidence interval for π. [2]

Answer by Boreal(15235) (Show Source): You can put this solution on YOUR website!
b. is definitely correct,
c. appears incorrect because np=17.5 and that is greater than 10.
a, SE is sqrt(p*(1-p)/n)=sqrt(.25/100)=0.05, which is correct
c. is the answer.
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