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314 Fundamentals of Probability and Statistics for Engineers

(b) With 99% confidence, what is the possible error if the proportion is estimated
to be 12/100 ˆ 0.12?
9.38 In a public opinion poll such as the one described in Example 9.21, determine the
minimum sample size needed for the poll so that with 95% confidence the sample
means will be within 0.05 of the true proportion. [Hint: use the fact that
X (1 X ) 1/4 in Equation (9.153).]

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