document.write( "Question 1182841: We wish to estimate what percent of adult residents in a certain county are parents.
\n" ); document.write( "Out of 100 adult residents sampled, 35 had kids.
\n" ); document.write( "Based on this, construct a 99% confidence interval for the proportion p of adult
\n" ); document.write( "residents who are parents in this county.\r
\n" ); document.write( "\n" ); document.write( "Express the answer in tri-inequality.
\n" ); document.write( "Answer as decimals, to 3 places.\r
\n" ); document.write( "\n" ); document.write( "_________ < p < __________ Express the same answer using the point estimate and margin of error.
\n" ); document.write( "Answer as decimals, to 3 places\r
\n" ); document.write( "\n" ); document.write( "p̂±E = _________ ± _____________
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Algebra.Com's Answer #813326 by Edwin McCravy(20065)\"\" \"About 
You can put this solution on YOUR website!
\r\n" );
document.write( "On your TI-84,\r\n" );
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document.write( "press STAT\r\n" );
document.write( "press the right arrow key twice to highlight TESTS\r\n" );
document.write( "Scroll down to A:1-PropZInt\r\n" );
document.write( "Press ENTER\r\n" );
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document.write( "Make the next screen read like this:\r\n" );
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document.write( "                      1-PropZInt\r\n" );
document.write( "                  x:35\r\n" );
document.write( "                  n:100\r\n" );
document.write( "                  C-Level:0.99 \r\n" );
document.write( "                  Calculate\r\n" );
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document.write( "Scroll down to highlight Calculate\r\n" );
document.write( "Press ENTER\r\n" );
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document.write( "Read this:\r\n" );
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document.write( "                      1-PropZInt\r\n" );
document.write( "                   (.22714,.47286) \r\n" );
document.write( "                   p̂=.35\r\n" );
document.write( "                   n=100\r\n" );
document.write( "        That means:\r\n" );
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document.write( "       0.22714 < p < 0.47286

\n" ); document.write( "Express the same answer using the point estimate and margin of error.
\r\n" );
document.write( "Notice that if you average the two boundaries of the interval you get point\r\n" );
document.write( "estimator p̂:\r\n" );
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document.write( "p̂ = \"%280.22714%2B0.47286%29%2F2=0.7%2F2=0.35\"\r\n" );
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document.write( "The margin of error E is the absolute value difference between the point-\r\n" );
document.write( "estimator, p̂, and either boundary:\r\n" );
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document.write( "E = |0.22714-0.35| = |0.47286-0.35| = 0.12286\r\n" );
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document.write( "p̂±E =  0.35 ± 0.12286\r\n" );
document.write( "\r\n" );
document.write( "Edwin

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