If n = 400 and P=.69 then 90% C.I for P is _________________?
Correct answer: A. 652 and . 728
- A. 652 and . 728
- B. .314 and .652
- C. .798 and .745
- D. None of these
Explanation
For a proportion, the 90% interval is p ± 1.645√[p(1−p)/n]. Substituting p = .69 and n = 400 gives approximately .69 ± .038, or .652 to .728.
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