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Ch 8. Assignment: Interval Estimation Back to Assignment Attempts: Keep the Highest:/1 Aa Aa s. Sample size for an interval estimate of a population proportion Suppose academic researchers are conducting a study to estimate the proportion of firms with a chief marketing officer in their top management teams. The project manager desires a 0.03 margin of error at 99% confidence. The planning value for p is p-0.4 Use the following Distributions tool to help you answer the question that follows Select a DistributionY Distributions To satisty the desired margin of error, a sample size no smaller than is needed Grade It Now Save MacBook Air
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Given that, Sample proportion (P)-0-4 Margin of error (E) 0.03 Level of significance, (a) 0.01 By using the z-table, the critical value at 1 % level of significance for a two tailed test is oo 2.58 2o0% Sample size: n-p (1 oAx )o.ox 2.576 0.03 0.4x (1-0.4)x - -1769.31 1770 A sample size no smaller than 1770 is needed

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