document.write( "Question 312605: To estimate the average annual expenses of students on books and class materials a sample of size 100 is taken. The average is $250 and the standard deviation is $40. A 99% confidence interval for the population mean is? \n" ); document.write( "

Algebra.Com's Answer #223579 by Fombitz(32388) $\"\"$ $\"About$

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$\"N=100\"$
\n" ); document.write( " $\"sigma=40\"$
\n" ); document.write( " $\"alpha=0.01\"$
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\n" ); document.write( " $\"DELTA=2.58%2Asigma%2Fsqrt%28N%29\"$
\n" ); document.write( " $\"DELTA=2.58%2A40%2Fsqrt%28100%29\"$
\n" ); document.write( " $\"DELTA=10.3\"$
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\n" ); document.write( "( $\"239.7\"$ , $\"260.3\"$ )\r
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