document.write( "Question 1080028: Lifetimes of AAA batteries are approximately normally distributed. A manufacturer wants to estimate the standard deviation of the lifetime of the AAA batteries it produces. A random sample of
\n" ); document.write( "22
\n" ); document.write( " AAA batteries produced by this manufacturer lasted a mean of
\n" ); document.write( "10.1
\n" ); document.write( " hours with a standard deviation of
\n" ); document.write( "1.9
\n" ); document.write( "hours. Find a
\n" ); document.write( "90%
\n" ); document.write( " confidence interval for the population standard deviation of the lifetimes of AAA batteries produced by the manufacturer. Then complete the table below.
\n" ); document.write( "Carry your intermediate computations to at least three decimal places. Round your answers to at least two decimal places. \n" ); document.write( "

Algebra.Com's Answer #694277 by Boreal(15235) $\"\"$ $\"About$

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90% CI here is mean +/- 1.721*s/sqrt(n)=1.721*1.9/sqrt (22)=0.6971
\n" ); document.write( "10.1+/-0.70
\n" ); document.write( "(9.40, 10.80)
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