document.write( "Question 1175528: We want to obtain a sample to estimate a population mean. Based on previous evidence, researchers believe the population standard deviation is approximately
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Algebra.Com's Answer #801164 by ewatrrr(24785) $\"\"$ $\"About$

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document.write( "Hi\r\n" );
document.write( "Normal distribution: σ = 62.4\r\n" );
document.write( "to be 99.5% confident that the estimate is within 2.5 of the true population mean. \r\n" );
document.write( "How large of a sample size is required? invNorm(.995) = 2.5758\r\n" );
document.write( "ME = 0r n = \r\n" );
document.write( " n =  = 4134 (rounded up to whole number)\r\n" );
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document.write( "Wish You the Best in your Studies.\r\n" );
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