document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1048466>Question 1048466</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Hello, can someone please check my work for a and b?  Also, I am not sure how to find the answer for c.  \r<BR>\n" );
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document.write( "Given the following data where  MPG is the response variable and weight is the explanatory variable:<BR>\n" );
document.write( "                (MPG,   Weight)<BR>\n" );
document.write( "Car 1-        25,      2365<BR>\n" );
document.write( "Car 2 -      22,      3020<BR>\n" );
document.write( "Car 3-       23,	     3235<BR>\n" );
document.write( "Car 4-        18,      3545<BR>\n" );
document.write( "Car 5-        19,      2905<BR>\n" );
document.write( "Car 6-        27,      2420<BR>\n" );
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document.write( "a. Interpret the meaning of the y-intercept and the slope within this scenario. \r<BR>\n" );
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document.write( "my answer but I am not sure how to interpret: y = 39.678 – 0.006x  \r<BR>\n" );
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document.write( "b. What would you predict the city MPG to be for a car that weighs 3000 pounds?  <BR>\n" );
document.write( "39.678 – 0.006(3000) = 21.678 MPG\r<BR>\n" );
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document.write( "c.If a car that weighs 3000 pounds actually gets 32 MPG, would this be unusual? Calculate the residual and talk about what that value represents.  \r<BR>\n" );
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document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #664060 by </B><A HREF=/tutors/aboutme.mpl?userid=Boreal><B>Boreal(15235)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=Boreal><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/cgi-bin/show-face.mpl?user=Boreal><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=664060\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> b to more decimal places is 0.00595, but your answer is correct<BR>\n" );
document.write( "That means a car with no weight would get 39.7 mpg.  The y-intercept in these problems is usually meaningless.  It says that with every pound increase, the mph will decrease 0.006.<BR>\n" );
document.write( "I would get 21.828 mpg, different, because I use 0.00595.<BR>\n" );
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document.write( "the residual would be 32-21.678=+10.322 mpg<BR>\n" );
document.write( "The other residuals are<BR>\n" );
document.write( "-0.60<BR>\n" );
document.write( "+0.42<BR>\n" );
document.write( "+2.32<BR>\n" );
document.write( "-0.108<BR>\n" );
document.write( "-3.39<BR>\n" );
document.write( "+1.72<BR>\n" );
document.write( "The mean of these values is 0.362, not too far from the 0 they should have, with a sd of 2.01.  To have a car that has a residual of 10 would be very unusual and suggest either some error in the data or a very special or different vehicle, since the residual is 5 sd from the mean of the residuals.\r<BR>\n" );
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