find the sample size needed to give a margin of error
to estimate a proportion within...
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find the sample size needed to give a margin of errorto estimate a proportion within plus minus 2% within 99% confidencewithin 95% confidence within 90% confidence assume no priorknowledge about the population proportion p
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SolutionGivenE Margin of Error 2 002p is unknown thus p 05Part a99 confidence levelFormulaZc is z critical value for c 099 confidencelevelFind Area 1c2 1 099 2 199 2 09950Thus look in z table for Area 09950 or its closest area andfind
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