document.write( "Question 1103204: In a sample of seven​ cars, each car was tested for​ nitrogen-oxide emissions​ (in grams per​ mile) and the following results were​ obtained:
\n" ); document.write( "0.080.08​, \r
\n" ); document.write( "\n" ); document.write( "0.070.07​, \r
\n" ); document.write( "\n" ); document.write( "0.140.14​, \r
\n" ); document.write( "\n" ); document.write( "0.170.17​, \r
\n" ); document.write( "\n" ); document.write( "0.190.19​, \r
\n" ); document.write( "\n" ); document.write( "0.170.17​, \r
\n" ); document.write( "\n" ); document.write( "0.18 .0.18.
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\n" ); document.write( " Assuming that this sample is representative of the cars in​ use, construct a
\n" ); document.write( "9898​%
\n" ); document.write( "confidence interval estimate of the mean amount of​ nitrogen-oxide emissions for all cars. If the EPA requires that​ nitrogen-oxide emissions be less than 0.165
\n" ); document.write( "g divided by mig/mi​,
\n" ); document.write( "can we safely conclude that this requirement is being​ met? \n" ); document.write( "
Algebra.Com's Answer #717975 by Boreal(15235)\"\" \"About 
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mean is 0.1429 and s=0.0489
\n" ); document.write( "CI is (0.085, 0.201)
\n" ); document.write( "t(df=6, 0.99) is 3.143
\n" ); document.write( "half interval about the mean is +/- 3.143(.0489)/sqrt(7)=0.0581
\n" ); document.write( "Because a number greater than 0.165 is in the CI, we cannot conclude that the emissions are less than 0.165 g/mg-mi \n" ); document.write( "
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