Question about Texas Instruments TI-84 Plus Calculator
Posted by Anonymous on
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
Type in your D (X ) values in L1 and the N (Y) values in L2 (see picture 1). Sorry the picture does not have YOUR values.
TO OBTAIN THE STATISTICAL RESULTS (optional)
Notice the down arrow next to n=7. That means the results screen has more valuesI need to find the equation for some points with - ab847d7.jpg down arrow to display.
You notice that the n=7 line now has an arrow pointing Up. Notice the Down Arrow onI need to find the equation for some points with - 37fb2ba.jpg 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.
However there is no correlation coefficient, no line of best fit, etc. To obtain that you have to perform a regression analysis.
E. 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. In this step you must select the exponential regression model.
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 BEST FIT CURVE ON 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 activeI need to find the equation for some points with - d6e8e98.jpghe line Mark you can choose the appearnce of the raw data point.
And here are your two graphs: the raw data scatter plot and the line of best fit on the same screen. On the picture the ZoomStat option was used.
Now, it is up to you to accept this model or to try another model.
Posted on May 16, 2010
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Posted on Jan 02, 2017
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