document.write( "Question 433174: A sample of 50 Hummer owners revealed that 40 have cut back on their driving due to the increased cost of gasoline. Give a 90% confidence interval for the proportion of Hummer owners who plan to cut back their driving. \n" ); document.write( "
Algebra.Com's Answer #300274 by stanbon(75887)\"\" \"About 
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A sample of 50 Hummer owners revealed that 40 have cut back on their driving due to the increased cost of gasoline. Give a 90% confidence interval for the proportion of Hummer owners who plan to cut back their driving.
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\n" ); document.write( "p-hat = 40/50 = 0.9
\n" ); document.write( "ME = 1.96*sqrt[0.9*0.1/50] = 0.083156
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\n" ); document.write( "90% CI: 0.9-0.0832 < P < 0.9+0.0832
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\n" ); document.write( "Cheers,
\n" ); document.write( "Stan H.\r
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