document.write( "Question 533820: 1. Find the equation of the regression line for the given data. Predict the value of Y when X=-2? Predict the value of Y when X = 4?
\n" ); document.write( "X -5 -3 4 1 -1 -2 0 2 3 -4
\n" ); document.write( "Y -10 -8 9 1 -2 -6 -1 3 6 -8\r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( " \n" ); document.write( "
Algebra.Com's Answer #351173 by Edwin McCravy(20054)\"\" \"About 
You can put this solution on YOUR website!
\r\n" );
document.write( "The newer TI-84 calculators are a little different from the older ones.\r\n" );
document.write( "The first and last part is the same on all of them.  I'll let you know \r\n" );
document.write( "when they differ:\r\n" );
document.write( "\r\n" );
document.write( "On your TI-84, \r\n" );
document.write( "\r\n" );
document.write( "Press CLEAR\r\n" );
document.write( "\r\n" );
document.write( "Press Y=\r\n" );
document.write( "\r\n" );
document.write( "clear anything that's there\r\n" );
document.write( "\r\n" );
document.write( "Press the up arrow to highlight Plot1\r\n" );
document.write( "\r\n" );
document.write( "Press ENTER\r\n" );
document.write( "\r\n" );
document.write( "Press STAT\r\n" );
document.write( "Press 1\r\n" );
document.write( "\r\n" );
document.write( "Enter the X values in L1\r\n" );
document.write( "Enter the Y values in L2\r\n" );
document.write( "\r\n" );
document.write( "Press STAT\r\n" );
document.write( "Press the right arrow\r\n" );
document.write( "Press 4\r\n" );
document.write( "\r\n" );
document.write( "Now here is where they differ.\r\n" );
document.write( "\r\n" );
document.write( "On the older versions you will see: |  On the newer versions you will see:\r\n" );
document.write( "                                    |             \r\n" );
document.write( "          LinReg(ax+b) ∎            |           LinReg(ax+b)\r\n" );
document.write( "Press VARS                          |         Xlist:L1 \r\n" );
document.write( "Press the right arrow               |         Ylist:L2\r\n" );
document.write( "Press 1                             |         FreqList: \r\n" );
document.write( "Press 1                             |         Store RegEQ:\r\n" );
document.write( "                                    |         Calculate\r\n" );
document.write( "You should see                      |         \r\n" );
document.write( "                                    | Press the down arrow 3 times to\r\n" );
document.write( "         LinReg(ax+b) Y1            | get cursor beside  Store RegEQ:∎\r\n" );
document.write( "                                    | Press ALPHA\r\n" );
document.write( "                                    | Press TRACE\r\n" );
document.write( "Press ENTER                         | Press ENTER   (puts Y1 after the colon)\r\n" );
document.write( "                                    | Press ENTER  \r\n" );
document.write( "                                    | Press ENTER\r\n" );
document.write( "-----------------------------------------------------------------------------                                    \r\n" );
document.write( "You will see:                                    \r\n" );
document.write( "                                     \r\n" );
document.write( "         y=ax+b                     \r\n" );
document.write( "         a=2.096969697              \r\n" );
document.write( "         b=-.5515151515               \r\n" );
document.write( "         r²=.9794161922             \r\n" );
document.write( "         r=.9896545822              \r\n" );
document.write( "                                    \r\n" );
document.write( "So the equation of the regression   \r\n" );
document.write( "line is                              \r\n" );
document.write( "\r\n" );
document.write( "y = 2.096969697x - .5515151515\r\n" );
document.write( "  \r\n" );
document.write( "Press ZOOM\r\n" );
document.write( "Press 9\r\n" );
document.write( "\r\n" );
document.write( "You will see the regression line graphed\r\n" );
document.write( "\r\n" );
document.write( "To predict the value when X = -2\r\n" );
document.write( "\r\n" );
document.write( "Press 2nd\r\n" );
document.write( "Press TRACE\r\n" );
document.write( "Press 1\r\n" );
document.write( "\r\n" );
document.write( "The graph comes back with X=∎\r\n" );
document.write( "Press -2   [Use the negative sign (-) not the minus sign —]\r\n" );
document.write( "Press ENTER\r\n" );
document.write( "\r\n" );
document.write( "Read at bottom of screen: X=-2            Y=-4.745455\r\n" );
document.write( "\r\n" );
document.write( "To predict the value when X = 4\r\n" );
document.write( "\r\n" );
document.write( "Press 4\r\n" );
document.write( "\r\n" );
document.write( "Read at bottom of screen: X=4            Y=7.8363636\r\n" );
document.write( "\r\n" );
document.write( "Edwin
\n" ); document.write( "
\n" );