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Posted on Sep 13, 2011
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I am trying to graph a least-squares line on my TI-84 Plus. I have the numbers correctly plugged into my Stat Edit tables, and I am able to access my linear equation, and the first time I entered my graph (ZoomStat) it was working fine and I could see the line, but was trying to figure out how to get the data points to appear. However, I backed out of the graph for a moment and may have deleted an equation left in my Y= button, but the next time I tried to look at my graph, all I am able to see is an empty axis. I have tried multiple times fixing this (turning calculator off, zooming in, putting in the numbers again) but nothing works.

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  • Posted on Sep 13, 2011
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After you enter the data draw the SCATTER plot first.
When you perform the (linear) regression analysis LineReg, save the regression equation to a function, for example Y1
The syntax is
LineReg L1, L2, Y1 ENTER


From the Stat>CALC menu press LineReg
The command echoes on command line
Press [2nd][1] to enter the L1 list on command line
Press [,] to separate
Press [2nd] [2] to enter L2 on the command line
Press [,] the comma again
Press [VARS][>][Y-Vars][1~Function][1:Y1] [ENTER]
Press [GRAPH] to have the regression line equation drawn
on the same screen as the Scatter Plot you drew before.

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