document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=78076>Question 78076</A>: <I><SPAN STYLE=\"word-break: break-all;\"> I am unable to answer this can someone help.\r<BR>\n" );
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document.write( "1. a) Historical data for Smith Cellular is charted below. Develop a linear model and use it to predict the amount of sales in the future years.\r<BR>\n" );
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document.write( "35\r<BR>\n" );
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document.write( "30   30____\r<BR>\n" );
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document.write( "25                  26___<BR>\n" );
document.write( "                       21.5___<BR>\n" );
document.write( "15                                   14.2___<BR>\n" );
document.write( "                                11.3__<BR>\n" );
document.write( "10<BR>\n" );
document.write( "             8___<BR>\n" );
document.write( "5\r<BR>\n" );
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document.write( "0\r<BR>\n" );
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document.write( "    2001    2002    2003   2004   2005   2006    \r<BR>\n" );
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document.write( "b) Explain your rational for the linear model that you develped. (Why did you choose the data points that you did to determine the model?)\r<BR>\n" );
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document.write( "c) Use your model to predict the sales in year 2010. </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #55991 by </B><A HREF=/tutors/aboutme.mpl?userid=stanbon><B>stanbon(75887)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=stanbon><IMG SRC=http://www.algebra.com/images/aboutme-small.gif BORDER=0 alt=\"About Me\" VALIGN=MIDDLE></A>&nbsp;<IMG SRC=http://www.algebra.com/images/nopicture.jpg><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=55991\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> 1. a) Historical data for Smith Cellular is charted below. Develop a linear model and use it to predict the amount of sales in the future years.\r<BR>\n" );
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document.write( "35\r<BR>\n" );
document.write( "\n" );
document.write( "30   30____\r<BR>\n" );
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document.write( "25                  26___<BR>\n" );
document.write( "                       21.5___<BR>\n" );
document.write( "15                                   14.2___<BR>\n" );
document.write( "                                11.3__<BR>\n" );
document.write( "10<BR>\n" );
document.write( "             8___<BR>\n" );
document.write( "5\r<BR>\n" );
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document.write( "0\r<BR>\n" );
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document.write( "    2001    2002    2003   2004   2005   2006    \r<BR>\n" );
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document.write( "b) Explain your rational for the linear model that you develped. (Why did you choose the data points that you did to determine the model?)<BR>\n" );
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document.write( "You have a set of 6 points: (1,30),(2,8) etc<BR>\n" );
document.write( "Put them in your calculator and run a Linear Regression program against<BR>\n" );
document.write( "the data.<BR>\n" );
document.write( "You get a least-squares regression line: sales=-1.69038(year)+24.69807...\r<BR>\n" );
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document.write( "c) Use your model to predict the sales in year 2010.<BR>\n" );
document.write( "Letting the year=10 you get sales = 7.7942<BR>\n" );
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document.write( "Cheers,<BR>\n" );
document.write( "Stan H. </SPAN>\n" );
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