document.write( "Question 326468: PROBLEM 6
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document.write( "Playbill magazine reported that the mean annual household income of its readers is $119,155.
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document.write( "(Playbill, January 2006). Assume this estimate of the mean annual household income is based on
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document.write( "a sample of 80 households, and based on past studies, the population standard deviation is known
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document.write( "to be σ = $30,000.
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document.write( "a. Develop a 90% confidence interval estimate of the population mean.\r
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document.write( "b. Develop a 95% confidence interval estimate of the population mean.
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document.write( "c. Develop a 99% confidence interval estimate of the population mean. \n" );
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Algebra.Com's Answer #233733 by Fombitz(32388)![]() ![]() You can put this solution on YOUR website! \n" ); document.write( "a) \n" ); document.write( ". \n" ); document.write( ". \n" ); document.write( "b) \n" ); document.write( ". \n" ); document.write( ". \n" ); document.write( "c) |