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Assume that a sample is used to estimate a population proportion p. Find the 90% confidence...

Assume that a sample is used to estimate a population proportion p. Find the 90% confidence interval for a sample of size 347 with 68% successes. Enter your answer as an open-interval (i.e., parentheses) using decimals (not percents) accurate to three decimal places.

C.I. =

Math   Statistics-And-Probability   
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Answer #1

(0.639, 0.721)

Refer Standard normal table/Z-table or use excel function "=NORM.S.INV((1-0.05))" to find the critical value of z.

Don't forget to include parentheses (brackets) in the answer

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