Question about Texas Instruments TI-84 Plus Silver Edition Graphic Calculator

I teach high school physics, and students are graping and conducting a LinReg for a set of data stored in lists (e.g. LinReg L3, L2, Y1).

No problem with this, it works great, but one student was getting different values for a, b, r2, r. I checked her lists, and they were all correct. I even tried re-entering all the data, but still got the same results.

I finally cleared the RAM ([MEM] RESET ... All RAM, and now we are getting the right answer.

Any ideas of what might have been wrong?

Thanks.

Probly because the calc was miscalibrated or someone screwed around with the variables...

hope this helps

Posted on Jun 11, 2008

Matric Results for Mpumalanga South Africa

Jan 07, 2014 | Calculators

Please contact the school directly. FixYa cannot give you the results of an unspecified event at an unspecified locale.

Nov 15, 2013 | Calculators

No, FixYa would not know that. Try contacting the school.

Oct 21, 2013 | Calculators

Your data must be in two lists L1 (for x-values), and L2 (for y-values). This is the default setting. Open the STAT utility, go to the regression models. Select your model then press ENTER. The command echoes on the main screen. For example let the regression be something called **LinReg.**

On the main screen you see**LinReg**

Complete the command line as follows

**LinReg L1, L2, Y1, ENTER**

You see the statistics including the regression equation.

If you go to**Y= **Editor you will see that **Y1 **contains the regression equation.

If you have already drawn the**scatter plot** for your data, pressing GRAPH will superpose the scatter plot and the **regression curve**., and you will be able to judge the goodness of the fit.

On the main screen you see

Complete the command line as follows

You see the statistics including the regression equation.

If you go to

If you have already drawn the

Sep 28, 2013 | Texas Instruments TI-84 Plus Silver...

There is nothing wrong with your English. The problem with your request is that the program you are talking about is NO program at all, but a collection of formulas that may serve as a cheat sheet. If your teacher wanted you to **make this program** he would have shown you the steps to key in. Besides it would be a lot more efficient to just write these formulas on the board. Sorry, there will be no help from me.

Your formulas 2 and 3 are useless, and formulas 7 and for the real solutions of a quadratic equation are wrong. The right member should be multiplied by 1/a.

How about trying to learn your formulas by heart? It is good for your memory and you will avoid being caught cheating.

Your formulas 2 and 3 are useless, and formulas 7 and for the real solutions of a quadratic equation are wrong. The right member should be multiplied by 1/a.

How about trying to learn your formulas by heart? It is good for your memory and you will avoid being caught cheating.

Apr 11, 2012 | Texas Instruments TI-84 Plus Calculator

I assume you know how to enter data in your calculator. The keystrokes in the following pertain to TI92/92Plus/ Voyage 200 PLT. The main differences with the TI89/Ti89 Titanium is that the function keys F6,F7,F8 are not accessed directly but by the key sequences [2nd][F1], [2nd][F2], and [2nd][F3] respectively

1. CLEAN THE SLATE (so to speak) and ENTER DATA

In Home folder run F6: NewProb to reset the configuration.

Press Apps, and select 6: data/Matrix editor. Select a new data set

Give it a name: here testing.

Press OK/ENTER, The data entry screen opens, enter your values.

When you finish press F2.PlotSetUp.

2. Statistical plot setup and scatter plot drawing

.

Press F1:define to configure Plot1. Choose Scatter, then choose a mark for the data point. I select 5:Dot. and press [ENTER

Select the data column X=c1, Y=c2

Press ENTER to save configuration. Press [CTRL] [GRAPH] On my TI92 the CTRL key is the [Diamond] key. On the following graph I changed the mark to a cross to see the data point better. I also played with the window dimension. You can also do that with ZoomStat. The graph remind me of a parabola (I know I chose the exact values)

3. STATISTICAL CALC. AND REGRESSION ANALYSES.

Now we have to find the equation that fits these data best.

You press APPS 6:Data/ Matrix editor but you select current to return to your data set. You are taken to the data entry editor (Figure 3 above). In that screen Press F5:Calc to edit the type of statistics you want

On first line select the type of regression model : Linear Regression, QuadReg quadratic regression (or anything else available) X is from column1, Y is from column 2. Store RegEQ The regression equation in say Y1(x)

Press ENTER to save to get the Regression Equation. Here it is

As you can see I cheated: a perfect parabola. R^2 =1.

And here the best fit represented on same graph as the statistical data

Usually you have to try different regression models, until you find the one that fits best the experimental data.

1. CLEAN THE SLATE (so to speak) and ENTER DATA

In Home folder run F6: NewProb to reset the configuration.

Press Apps, and select 6: data/Matrix editor. Select a new data set

Give it a name: here testing.

Press OK/ENTER, The data entry screen opens, enter your values.

When you finish press F2.PlotSetUp.

2. Statistical plot setup and scatter plot drawing

.

Press F1:define to configure Plot1. Choose Scatter, then choose a mark for the data point. I select 5:Dot. and press [ENTER

Select the data column X=c1, Y=c2

Press ENTER to save configuration. Press [CTRL] [GRAPH] On my TI92 the CTRL key is the [Diamond] key. On the following graph I changed the mark to a cross to see the data point better. I also played with the window dimension. You can also do that with ZoomStat. The graph remind me of a parabola (I know I chose the exact values)

3. STATISTICAL CALC. AND REGRESSION ANALYSES.

Now we have to find the equation that fits these data best.

You press APPS 6:Data/ Matrix editor but you select current to return to your data set. You are taken to the data entry editor (Figure 3 above). In that screen Press F5:Calc to edit the type of statistics you want

On first line select the type of regression model : Linear Regression, QuadReg quadratic regression (or anything else available) X is from column1, Y is from column 2. Store RegEQ The regression equation in say Y1(x)

Press ENTER to save to get the Regression Equation. Here it is

As you can see I cheated: a perfect parabola. R^2 =1.

And here the best fit represented on same graph as the statistical data

Usually you have to try different regression models, until you find the one that fits best the experimental data.

Jul 26, 2010 | Texas Instruments TI-89 Calculator

When you press [STAT] and right Arrow to highlight CALC you see two linear regression model [4:LinReg(ax+b)] and [8:LinReg(a +bx)]

If you select [4: ...] the command echoes on main calculator screen as LinReg(ax+b) and a blinking cursor

If you press [ENTER] you will get your equation, a, b, and r^2 if DiagnosticsOn command has been executed before. However you will not be able to see the line of best fit on top of the raw data scatter plot.

To save the equation of best fit in a function variable, ex Y1, you complete the command as follows

LinReg(ax+b) [VARS][=>][Y-VARS][1:Function][1:Y1]

The Y1 variable will appear on main calculator screen, and you have

LinReg(ax+b) Y1

Press [ENTER]

Screen display the equation, its parameter and its correlation coefficients (if so configured).

Press [GRAPH] to draw the line of best fit on top of the scatter plot.

Here are two screen captures to show you the equation and the line of best fit.

As you can see from the value of r^2, and the graph, a linear regression does not seem good.

If you select [4: ...] the command echoes on main calculator screen as LinReg(ax+b) and a blinking cursor

If you press [ENTER] you will get your equation, a, b, and r^2 if DiagnosticsOn command has been executed before. However you will not be able to see the line of best fit on top of the raw data scatter plot.

To save the equation of best fit in a function variable, ex Y1, you complete the command as follows

LinReg(ax+b) [VARS][=>][Y-VARS][1:Function][1:Y1]

The Y1 variable will appear on main calculator screen, and you have

LinReg(ax+b) Y1

Press [ENTER]

Screen display the equation, its parameter and its correlation coefficients (if so configured).

Press [GRAPH] to draw the line of best fit on top of the scatter plot.

Here are two screen captures to show you the equation and the line of best fit.

As you can see from the value of r^2, and the graph, a linear regression does not seem good.

Feb 01, 2010 | Texas Instruments TI-84 Plus Calculator

Read this post. It answers all your questions and shows you HOW to do find your equation of best fit, correlation coefficients, etc.

Before doing statistics, you have to prepare the calculator by clearing old data that may generate errors.

A. To clear old data

To obtain the correlation coefficient in a statistical analysis on the TI8xPlus family of calculators you must activate the DiagnosticsOn option. To access the command

D. Enter the data

Press [STAT][1:Edit]

Type in the X values in L1 and the Y values in L2 (see picture 1)

To obtain the statistical results

Notice the down arrow next to n=7. That means the results screen has more values. Press the down arrow to display.

You notice that the n=7 line now has an arrow pointing Up. Notice the Down Arrow on the bottom line (more data is coming). Here is the rest of the statistical results.

There is no arrow at the bottom of the picture. End of statistical results.

The screen captures with 2-Var Stats summarize all the satistics. Some of the values your are looking for are among the result. NOW it is you mission to identify what you need (I chewed all the work for you).

However there is no correlation coefficient, no line of best fit, etc. To obtain that you have to perform a regression analysis.

Perform a Regression analysis

To perform a regression analysis, you must try several regression models and then find the one that mimicks the raw data best. In this particular case, you have already decided to do a linear regression, and that is good for me. I do not have the time to take you through all of them. A linear regression it will be.

The slope is a and the y-intercept is b. You also have r and its square. You need to read your theory to know which of the two correlation coefficients you have been asked to obtain.

Since you saved the equation in the Y1 function you can draw it. You just have to press GRAPH and it will be drawn. But that will not tell how good the fit is, until you see the function drawn on top of the raw data.

Drawing the scatter plot and the raw data on the same screen.

Regardless of the curve of best fit, you can draw a scatter plot as follows.

Here plot1 is active (ON), it is scatter plot (first icon) the Xlist is L1 by default but you can change it to some other list. Notice the highlighted A cursor on XLIST line. It means that the [ALPHA] keyboard is active.

On the line Mark you can choose the appearnce of the raw data point.

And here is your two graphs: the raw data scatter plot and the line of best fit on the same screen

Now, it is up to you to accept this model or to try another model.

Before doing statistics, you have to prepare the calculator by clearing old data that may generate errors.

A. To clear old data

- Press [2nd][+] (MEM) to open the memory management screen.
- Press [4:ClrAllLists]
- The command echoes on main screen, press [ENTER] to run it.
- Calculator displays Done.

- Press [STAT][5:SetUpEditor] [ENTER] ; calculator displays Done.

To obtain the correlation coefficient in a statistical analysis on the TI8xPlus family of calculators you must activate the DiagnosticsOn option. To access the command

- You press [2nd] [0] (CATALOG)
- While the list of commands is displayed, press [X^-1] (D)
- Cursor jumps to first command that starts with D, dayOfWk(
- Press the DownArrow 9 times to reach DiagnosticsOn
- Select it and press [ENTER]
- Command echoes on main calculator screen with blinking cursor
- Press [ENTER] to set the option
- Calculator displays Done.

D. Enter the data

Press [STAT][1:Edit]

Type in the X values in L1 and the Y values in L2 (see picture 1)

To obtain the statistical results

- After you finish entering the data, press [2nd][Quit] to exit StatEditor.
- Press [STAT] and highlight Menu (CALC)
- In the list select [2:2-Var Stats]
- Command echoes on main screen.
- Press [ENTER] to calculate the stats

Notice the down arrow next to n=7. That means the results screen has more values. Press the down arrow to display.

You notice that the n=7 line now has an arrow pointing Up. Notice the Down Arrow on the bottom line (more data is coming). Here is the rest of the statistical results.

There is no arrow at the bottom of the picture. End of statistical results.

The screen captures with 2-Var Stats summarize all the satistics. Some of the values your are looking for are among the result. NOW it is you mission to identify what you need (I chewed all the work for you).

However there is no correlation coefficient, no line of best fit, etc. To obtain that you have to perform a regression analysis.

Perform a Regression analysis

To perform a regression analysis, you must try several regression models and then find the one that mimicks the raw data best. In this particular case, you have already decided to do a linear regression, and that is good for me. I do not have the time to take you through all of them. A linear regression it will be.

- Press [STAT] , highlight [CALC]
- In the list of regression models select [4:LinReg (ax+b)
- The command LinReg(ax+b) echoes on main calculator screen.
- If you press [ENTER] you will get you equation but you will not be able to draw the curve on top of your data to verify the goodness (no it is not a swear word) of the fit. So you must save the equation as a function in Y1 variable.
- While LinReg(ax+b) command is still in command line, press the [VARS] key.
- Highlight the [Y-VARS] menu and select [1:Function], then press [ENTER].
- In the Y function variable list select [1:Y1]
- At the command line, you have LinReg(ax+b) Y1.
- Press [ENTER] to save the equation of best fit in Y1.

The slope is a and the y-intercept is b. You also have r and its square. You need to read your theory to know which of the two correlation coefficients you have been asked to obtain.

Since you saved the equation in the Y1 function you can draw it. You just have to press GRAPH and it will be drawn. But that will not tell how good the fit is, until you see the function drawn on top of the raw data.

Drawing the scatter plot and the raw data on the same screen.

Regardless of the curve of best fit, you can draw a scatter plot as follows.

- Press [2nd][Y=] (STATPLOT)
- Select [1:Plot1...Off] to open plot1 configuration screen
- Use arrow to highlight On
- Use the down arrow to move cursor to the line Type.
- Select the first icon for a scatter plot. NOTE: To navigate the 6 statistical stat plots on the line Type, use the right or left arrow (to backtrack), but not the Up or down arrows.

Here plot1 is active (ON), it is scatter plot (first icon) the Xlist is L1 by default but you can change it to some other list. Notice the highlighted A cursor on XLIST line. It means that the [ALPHA] keyboard is active.

On the line Mark you can choose the appearnce of the raw data point.

And here is your two graphs: the raw data scatter plot and the line of best fit on the same screen

Now, it is up to you to accept this model or to try another model.

Jan 28, 2010 | Texas Instruments TI-84 Plus Silver...

OK, you convinced me to do your homework for you.

Before doing statistics, you have to prepare the calculator by clearing old data that may generate errors.

A. To clear old data

To obtain the correlation coefficient in a statistical analysis on the TI8xPlus family of calculators you must activate the DiagnosticsOn option. To access the command

D. Enter the data

Press [STAT][1:Edit]

Type in the X values in L1 and the Y values in L2 (see picture 1)

To obtain the statistical results

Notice the down arrow next to n=7. That means the results screen has more values. Press the down arrow to display.

You notice that the n=7 line now has an arrow pointing Up. Notice the Down Arrow on the bottom line (more data is coming). Here is the rest of the statistical results.

There is no arrow at the bottom of the picture. End of statistical results.

The screen captures with 2-Var Stats summarize all the satistics. Some of the values your are looking for are among the result. NOW it is you mission to identify what you need (I chewed all the work for you).

However there is no correlation coefficient, no line of best fit, etc. To obtain that you have to perform a regression analysis.

Perform a Regression analysis

To perform a regression analysis, you must try several regression models and then find the one that mimicks the raw data best. In this particular case, you have already decided to do a linear regression, and that is good for me. I do not have the time to take you through all of them. A linear regression it will be.

The slope is a and the y-intercept is b. You also have r and its square. You need to read your theory to know which of the two correlation coefficients you have been asked to obtain.

Since you saved the equation in the Y1 function you can draw it. You just have to press GRAPH and it will be drawn. But that will not tell how good the fit is, until you see the function drawn on top of the raw data.

Drawing the scatter plot and the raw data on the same screen.

Regardless of the curve of best fit, you can draw a scatter plot as follows.

Here plot1 is active (ON), it is scatter plot (first icon) the Xlist is L1 by default but you can change it to some other list. Notice the highlighted A cursor on XLIST line. It means that the [ALPHA] keyboard is active.

On the line Mark you can choose the appearnce of the raw data point.

And here is your two graphs: the raw data scatter plot and the line of best fit on the same screen

Now, it is up to you to accept this model or to try another model.

N

Before doing statistics, you have to prepare the calculator by clearing old data that may generate errors.

A. To clear old data

- Press [2nd][+] (MEM) to open the memory management screen.
- Press [4:ClrAllLists]
- The command echoes on main screen, press [ENTER] to run it.
- Calculator displays Done.

- Press [STAT][5:SetUpEditor] [ENTER] ; calculator displays Done.

To obtain the correlation coefficient in a statistical analysis on the TI8xPlus family of calculators you must activate the DiagnosticsOn option. To access the command

- You press [2nd] [0] (CATALOG)
- While the list of commands is displayed, press [X^-1] (D)
- Cursor jumps to first command that starts with D, dayOfWk(
- Press the DownArrow 9 times to reach DiagnosticsOn
- Select it and press [ENTER]
- Command echoes on main calculator screen with blinking cursor
- Press [ENTER] to set the option
- Calculator displays Done.

D. Enter the data

Press [STAT][1:Edit]

Type in the X values in L1 and the Y values in L2 (see picture 1)

To obtain the statistical results

- After you finish entering the data, press [2nd][Quit] to exit StatEditor.
- Press [STAT] and highlight Menu (CALC)
- In the list select [2:2-Var Stats]
- Command echoes on main screen.
- Press [ENTER] to calculate the stats

Notice the down arrow next to n=7. That means the results screen has more values. Press the down arrow to display.

You notice that the n=7 line now has an arrow pointing Up. Notice the Down Arrow on the bottom line (more data is coming). Here is the rest of the statistical results.

There is no arrow at the bottom of the picture. End of statistical results.

The screen captures with 2-Var Stats summarize all the satistics. Some of the values your are looking for are among the result. NOW it is you mission to identify what you need (I chewed all the work for you).

However there is no correlation coefficient, no line of best fit, etc. To obtain that you have to perform a regression analysis.

Perform a Regression analysis

To perform a regression analysis, you must try several regression models and then find the one that mimicks the raw data best. In this particular case, you have already decided to do a linear regression, and that is good for me. I do not have the time to take you through all of them. A linear regression it will be.

- Press [STAT] , highlight [CALC]
- In the list of regression models select [4:LinReg (ax+b)
- The command LinReg(ax+b) echoes on main calculator screen.
- If you press [ENTER] you will get you equation but you will not be able to draw the curve on top of your data to verify the goodness (no it is not a swear word) of the fit. So you must save the equation as a function in Y1 variable.
- While LinReg(ax+b) command is still in command line, press the [VARS] key.
- Highlight the [Y-VARS] menu and select [1:Function], then press [ENTER].
- In the Y function variable list select [1:Y1]
- At the command line, you have LinReg(ax+b) Y1.
- Press [ENTER] to save the equation of best fit in Y1.

The slope is a and the y-intercept is b. You also have r and its square. You need to read your theory to know which of the two correlation coefficients you have been asked to obtain.

Since you saved the equation in the Y1 function you can draw it. You just have to press GRAPH and it will be drawn. But that will not tell how good the fit is, until you see the function drawn on top of the raw data.

Drawing the scatter plot and the raw data on the same screen.

Regardless of the curve of best fit, you can draw a scatter plot as follows.

- Press [2nd][Y=] (STATPLOT)
- Select [1:Plot1...Off] to open plot1 configuration screen
- Use arrow to highlight On
- Use the down arrow to move cursor to the line Type.
- Select the first icon for a scatter plot. NOTE: To navigate the 6 statistical stat plots on the line Type, use the right or left arrow (to backtrack), but not the Up or down arrows.

Here plot1 is active (ON), it is scatter plot (first icon) the Xlist is L1 by default but you can change it to some other list. Notice the highlighted A cursor on XLIST line. It means that the [ALPHA] keyboard is active.

On the line Mark you can choose the appearnce of the raw data point.

And here is your two graphs: the raw data scatter plot and the line of best fit on the same screen

Now, it is up to you to accept this model or to try another model.

N

Jan 21, 2010 | Texas Instruments TI-83 Plus Calculator

Hello,

1.Press [MODE], scroll to set**Func**tion graphing mode.

2.Press [STAT] [5:SetUpEditor], command is pasted in home screen. Press [ENTER]. Screen displays Done. This clears old values in lists

3. Press [STAT][1:Edit] to enter data.

Press [ENTER] after each number. Cursor moves to next row. After finishing the data of Listt L1, use arrow right and UP to the head of list L2. Enter the values in list L2. Press Enter after last element.

4. Press [Y=] to display Y= editor. Clear function Y1 and all functions or remove highlight from the = in Y2, Y3, etc.

5.Press [2nd][STATPLOT]1 to select 1:Plot1

The blinking cursor on ON means graph will be drawn. Type chosen is Scatter plot. Mark chosen is a dot.

Press [ZOOM][9:ZoomStat]

If you think that the curve look like a straight line you can try to do a linear regression.

Press [STAT] Arrow right to highlight [CALC]

Select [4: LinReg(ax+b)]

LinReg(ax+b) echoes on run screen. Press [2nd] L1 Press comma, Press [2nd] L2 press comma Press [VARS] Arrow right to select [Y:VARs][1:Function] [ENTER][1:Y1]

ENTER

That is the equation for the linear regression. As you see eqaution has been saved in Y1. Press [GRAPH] to get the data and the regression curve drawn on same graph.

Hope it helps.

1.Press [MODE], scroll to set

2.Press [STAT] [5:SetUpEditor], command is pasted in home screen. Press [ENTER]. Screen displays Done. This clears old values in lists

3. Press [STAT][1:Edit] to enter data.

Press [ENTER] after each number. Cursor moves to next row. After finishing the data of Listt L1, use arrow right and UP to the head of list L2. Enter the values in list L2. Press Enter after last element.

4. Press [Y=] to display Y= editor. Clear function Y1 and all functions or remove highlight from the = in Y2, Y3, etc.

5.Press [2nd][STATPLOT]1 to select 1:Plot1

The blinking cursor on ON means graph will be drawn. Type chosen is Scatter plot. Mark chosen is a dot.

Press [ZOOM][9:ZoomStat]

If you think that the curve look like a straight line you can try to do a linear regression.

Press [STAT] Arrow right to highlight [CALC]

Select [4: LinReg(ax+b)]

LinReg(ax+b) echoes on run screen. Press [2nd] L1 Press comma, Press [2nd] L2 press comma Press [VARS] Arrow right to select [Y:VARs][1:Function] [ENTER][1:Y1]

ENTER

That is the equation for the linear regression. As you see eqaution has been saved in Y1. Press [GRAPH] to get the data and the regression curve drawn on same graph.

Hope it helps.

Oct 04, 2009 | Texas Instruments TI-84 Plus Calculator

Jul 21, 2014 | Texas Instruments TI-84 Plus Silver...

243 people viewed this question

Usually answered in minutes!

PS. This was on a TI 84 Silver Edition, but the students who were getting the right answers were using a variety of 83/84s.

I have similar problem, except now I reset it and the r and r2 are gone!!!

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