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Interval estimates for proportions — Question 70

Original QCE Vault practice · 1 mark

Q70 · Practice questionTechnology-activeSimple familiar1 mark

QUESTION 70

A sample of size 400400 has p^=0.30\hat p=0.30. Using z=1.96z=1.96, the approximate margin of error of a 95% confidence interval is
(A)
0.0210.021
(B)
0.0300.030
(C)
0.0360.036
(D)
0.04490.0449
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