document.write( "Question 1157903: You measure 47 textbooks' weights, and find they have a mean weight of 59 ounces. Assume the population standard deviation is 3.5 ounces. Based on this, construct a 99% confidence interval for the true population mean textbook weight.\r
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\n" ); document.write( "\n" ); document.write( "________ < μ < __________.
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Algebra.Com's Answer #780849 by Boreal(15235)\"\" \"About 
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half-interval is z(0.995)*sigma/sqrt(n)
\n" ); document.write( "=2.576*3.5/sqrt(47)
\n" ); document.write( "=1.315
\n" ); document.write( "(57.69 < mu > 60.32) units ounces
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