Question about Texas Instruments TI-84 Plus Calculator

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I have an TI-84 and when I put in my points in L1 and L2 I get my graph but when I go to my tables it doesn't show my points instead I get the X that shows up when there isn't points in.

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When you do your regression (stat --> calc --> linReg/QuadReg/whichever regression you're doing)) make sure you put the equation into Y1 before going to the table.

Posted on Sep 17, 2011

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Why can't i see the plotted points when i try to graph my L1 in a scatter-plot?


You cannot have a scatter plot with just one variable. You need values in L1 and values in L2. If you have only one set of values you can do 1-var statistics and plot a histogram (x-value vs. frequency).

Oct 06, 2013 | Texas Instruments TI-84 Plus Silver...

1 Answer

I get a ERR: DIM MISMATCH when I try to use graph an inequality using the inequalz app


Your TI-84 Plus displays the ERR:DIM MISMATCH error if you are trying to perform an operation that references one or more lists or matrices whose dimensions do not match.
For example, multiplying L1*L2, where L1={1,2,3,4,5} and L2={1,2} produces an ERR:DIM MISMATCH error because the number of elements in L1 and L2 do not match

Nov 29, 2012 | Texas Instruments TI-84 Plus Silver...

1 Answer

How to graph 5th degree polynomial TI 84


The TI-84 does not have a built-in quintic fit.

The most common scheme for fitting a model to data is the least squares. You'll find several programs to calculate this here.

May 24, 2012 | Texas Instruments TI-84 Plus Calculator

2 Answers

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...


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.

Sep 13, 2011 | Texas Instruments TI-84 Plus Calculator

1 Answer

I have a TI-84 plus calculator. I enter data into a table (L1 & L2) and go through the steps to get an equation for the data. Next, I should be able to press VARS, move to Y-VARS, select FUNCTION,...


Your assumption
--Next, I should be able to press VARS, move to Y-VARS, select FUNCTION, then select Y-1 and automatically enter the equation into Y-1.-
is not correct.

When you press [STAT[>][CALC][4:LinReg(ax+b)] or any other regression model,the command echoes on the main screen. If you press [ENTER] at this point, the calculator uses by default lists L1 and L2 and displays the resulting equation without copying it in a Y-variable.

If you want to have the equation copied on a Y-function, you should modify the command as follows
LineReg(ax+b) [SHIFT][1: L1] [,] SHIFT[2:L2] [,] [VARS][>:Y-Vars] [1:Function][1:Y-1][ENTER].

Here, [>] stands for RightArrow. For any other regression model, use the appropriate command.
At this point, the command line should look like the following:

LinReg(ax+b) L1, L2, Y1

Press [ENTER] to calculate you get the same screen as when you do not save the equation in Y1, but if you go to the Y= editor or press GRAPH, you will see the regression line superposed on the scatter plot.

Jul 13, 2011 | Texas Instruments TI-84 Plus Calculator

1 Answer

How do you get the table ([2ND GRAPH]) from the [STAT] [EDIT] [L1] [L2] list to appear with [Y1] in the second the column? The information appears in the scatter plot, but the information in the table does...


Instead of hitting the [table] button. You should hit the [stat] or [stats] button as I forget which it is. Then hit [enter] which will bring you to a stats list editor of some kind. You will want to enter the data for your x-axis in L1 and the data for your y-axis in L2. Once you have completed your lists, hit the [stat] button again and then click [right] or the right arrow in order to move to the section of calc. from number 4 down it will help create a graph of that type of function. lets say you think it is linear, so you hit [enter] on number 4 and then you will be at the home screen with LinReg already written. You just have to complete the statement and it will do it for you. hit the [2nd] [1] and then the comma button, then [2nd] [2] and [enter]. that will do it for you.

Feb 14, 2011 | Texas Instruments TI-84 Plus Silver...

1 Answer

How to graph points on an "X" and "Y" graph


click the STAT key, then edit (first option). enter X points in L1 and Y points in L2 so that the number matches up with the number across from it, making coordinates. so if the points were (1,2) , (3,4) , and (5,6), the 1,3, and 5 are in L1 and 2,4, and 6 are in L2 in that order. click 2ND, STATPLOT and hit enter to chose the settings (so make sure ON is highlighted). this is where you can change which list X or Y uses (so X doesnt have to be L1). lastly, make sure that the WINDOW settings are matching your data (Xmin is smallest X, Xmax is largest X, X scale is when the hash-marks should apear on the graph (to turn them on go to 2ND, FORMAT) and when you hit the GRAPH key, your graph should apear. also, to make your window a different size easily, use the ZOOM key near the GRAPH key.

Jan 25, 2011 | Texas Instruments TI-84 Plus Calculator

1 Answer

I want to enter in numbers for L1 and L2, but when I go the TABLE there is no L1 or L2 column, only X, and there are numbers entered in the X column that I want to delete. How do I clear the X values,...


The table is where the calculator displays values from functions entered in the Y= page. To enter numbers into lists, press STAT and select Edit to get into the list editor.

Dec 21, 2010 | Texas Instruments TI-84 Plus Calculator

1 Answer

Hi- on my Ti-84 plus Under STAT EDIT I do not have L1. It goes straight to L2 and so I can't graph anything.....any ideas on how to get my L1 back? thanks!


Even if you do not have L1 you can still graph: You have 6 lists to put data in. You are not required to use L1 but you will have to specify the lists. Be it as it may you can restore L1, which in all likelihood you deleted.
Press the [STAT] key and select [4:SetUpEditor] then press [ENTER]

Sep 11, 2010 | Texas Instruments TI-84 Plus Calculator

1 Answer

Graphing


Press STAT, go to Edit, then enter x values in L1 and y values in L2 (other lists can be used too, but these are the default ones).

Next, go to STAT PLOT, pick a plot, turn it on, select the type, data lists (x and y should be L! and L2 already; if not, change them), and mark type.

Finally, hit graph. You may need to adjust window settings to see all of the points. If you get a DIM MISMATCH error, check to make sure that there are the same number of entries in each list, and that only the plots that you are using are turned on.

Oct 25, 2007 | Texas Instruments TI-84 Plus Calculator

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