document.write( "Question 150568: Find the value for the correlation coefficient r\r
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\n" ); document.write( "y 5, 10, 12, 4, 8 \r
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Algebra.Com's Answer #110541 by Edwin McCravy(20055)\"\" \"About 
You can put this solution on YOUR website!
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document.write( " Find the value for the correlation coefficient r \r\n" );
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document.write( "x | 5,  1,  4, 2, 3 \r\n" );
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document.write( "y | 5, 10, 12, 4, 8 \r\n" );
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document.write( "Can anyone help?\r\n" );
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document.write( "It's a terrible formula! But if you have a TI-83 \r\n" );
document.write( "or TI-84, you can find it easily.\r\n" );
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document.write( "First you have to turn the Diagnostics On; \r\n" );
document.write( "otherwise the correlation coefficient won't\r\n" );
document.write( "be displayed with the regression line equation.\r\n" );
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document.write( "You press 2nd 0 for CATALOG\r\n" );
document.write( "Scroll down alphabetically to Diagnostics On\r\n" );
document.write( "Press ENTER and you'll see \"Done\".\r\n" );
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document.write( "Then they will stay on as long as you don't\r\n" );
document.write( "turn the Diagnostics Off\r\n" );
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document.write( "Now press STAT 1\r\n" );
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document.write( "Put\r\n" );
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document.write( "5 1 4 2 3 in L1\r\n" );
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document.write( "and\r\n" );
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document.write( "5 10 12 4 8 in L2\r\n" );
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document.write( "Press STAT and the right arrow to highlight CALC\r\n" );
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document.write( "Press 4 for  LinReg(ax+b)\r\n" );
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document.write( "Then press ENTER\r\n" );
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document.write( "You see\r\n" );
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document.write( "LinReg\r\n" );
document.write( " y=ax+b\r\n" );
document.write( " a=-.2\r\n" );
document.write( " n=8.4\r\n" );
document.write( " rē=.0089285714\r\n" );
document.write( " r=-.0944911183\r\n" );
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document.write( "That value of r is the regression coefficient.\r\n" );
document.write( "That is very small in absolute value, which\r\n" );
document.write( "means that the points are not very close to \r\n" );
document.write( "falling in a straight line.\r\n" );
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document.write( "Edwin
 
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