The CSUDH MAT131

TI-83/PlusTutorial

 

 

For items in white, press the button.  For items in yellow use the 2ndkey.  For items in green use thealpha key.  Keep your cool.  Don’t throw your calculator.  Ask for help sooner than later.

 

 

Inserting Data

 

            PressSTAT

            SelectEDIT

            Choosea list from L1 to L6

            Insertdata and use the up and down arrow keys to navigate the data set

 

Plotting 1 variable data:  Histogram

 

            PressSTAT PLOT (use the “2nd” key)

            Selectone of the stat plots listed from 1 to 5. Navigate using up/down keys

            SelectON

            Godown one level

            Selectthe histogram icon (the picture that looks like a histogram)

            Selectthe appropriate list

            PressGRAPH

            Adjustthe window by pressing the WINDOW button and adjusting the variables

            Adjustthe window by selecting ZOOM and then selecting ZOOMPLOT

 

Making a box plot:

 

            PressPress STAT PLOT

            Selectthe appropriate stat plot selection from 1 to 5.

            Turnon the stat plot by selecting ON

            Selectthe box plot icon in row 2 position 2 by moving the cursor to the right

            Selectthe appropriate list of data

            PressGRAPH

            Adjustthe window as described above

           

1-variable stats

            Afterinserting your data into a list, select STAT

            Usethe right arrow to move to the CALC menu

            Select1-Var Stats

            Inputthe appropriate list

            PressENTER

            Scrollup and down to view all the statistics

 

Graphing the normal distribution

  1. Turn off all stat plots and other functions. 
  2. Go to Y=
  3. Press DISTR (press 2nd ,VARS)
  4. Select normalpdf(
  5. You should see

Y=normalpdf(

 

  1. Y=normalpdf(X, mean, stdev), where you replace mean, stdev with their numerical values
  2. GRAPH
  3. Adjust the window in accordance with the values of the mean and standard deviation
  4. Use ZOOMFIT under the ZOOM menu once you have found a reasonalble window to see your graph

 

Computing probabilities

 

  1. Go the the standard screen
  2. Select DISTR 
  3. Select Normalcdf(                                (#2 not pdf)
  4. Normalcdf(lower #, upper #, mean, stdev)
  5. Example:  Normalcdf(600,700,504,111) computes the percentage that the variable lies between 600 and 700, for a normal distribution with mean = 504 and stdev = 111.
  6. This method is only for variables with a normal distribution
  7. This method can be used instead of the method, which uses table A and the z-score.  You must still know how to take z-scores and use table A, however.

 

           

TI-83 Turn on Diagnostic to enable some statistics features

Only have to do this once:

 

  1. Press 2nd Catolog,
  2. Move cursor to Diagnostic On, Press Enter
  3. You’ll be at the home screen.  Press Enter again.

 

Computing Correlation and linear regression using your TI-83

 

  1. Go to STAT, then CALC
  2. Select #4
  3. You should see LinReg(ax+b)
  4. Type in the lists.  The horizontal axis goes first

LinReg(ax+b)L1,L2

In this case L1 is the horizontal axis.  L2 is the vertical

  1. Press ENTER

 

Graphing a Line

  1. Press “y=“
  2. Type in the equation
  3. Find the appropriate window
  4. Press “graph”

 

 

Finding the Linear Regression using your Calculator

  1. Go to STAT and then CALC menu
  2. Select LinReg(a+bx)
  3. Type LinReg(a+bx) Lx,Ly (where Lx is the data set for the horizontal axis, and Ly is the data set for the vertical axis)

 

*Only use LinReg(a+bx)  (option #8)

**Do NOT use LinReg(ax+b) (option #4)

 

Plotting Residuals

  1. Put the data into two lists and do the LinReg(a+bx) calculation.
  2. Go to an empty list.  Put the cursor at the name of the empty list (e.g. L1 or L?) Press LIST.  Under NAMES you will see RESID.  Select RESID and press enter.
  3. You’ll be returned to the list screen.  At the bottom you should see L?=LRESID.  Press enter.  The residuals should appear.  Now plot the residuals vs. the explanatory variable in a new scatterplot.

 

 

Statistical Tests

 

  1. To access the library of statistical tests on your TI, Press STAT.
  2. Use the right arrow key to select  TESTS.
  3. Select the appropriate statistical test using the up-down arrow keys.
  4. See handouts from chapter 16 and chapter 17 on how to implement the 1-sample T-test. 

Ch 16 handout in PDF format

Ch 17 handout in PDF format