document.write( "Question 927156: When σ = 10, what sample size is needed to specify a
\n" ); document.write( "95% confidence interval of ±3 units for the mean? \n" ); document.write( "
Algebra.Com's Answer #562719 by stanbon(75887)\"\" \"About 
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When σ = 10, what sample size is needed to specify a
\n" ); document.write( " 95% confidence interval of ±3 units for the mean?
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\n" ); document.write( "n = [z*s/E]^2
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\n" ); document.write( "n = [1.96*10/3]^2 = 7 when rounded up.
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\n" ); document.write( "Cheers,
\n" ); document.write( "Stan H. \n" ); document.write( "
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