The TI-83 Calculator Bruce Thomas Mathematics Department Kennesaw State University

Outline of the Tutorial  The basic TI-83 keys  The home screen and PEMDAS  Important special keys  Discrete functions: lists and scatter plots  Continuous functions: equations and graphs  Modeling discrete data  Questions and answers

Basic TI-83 Keys  On  Multifunction keys  Screen brightness  Negative vs. subtract (-) -  Arithmetic operations      Clear vs. Quit

The Home Screen and PEMDAS  It’s a calculator! * 4 = 18  It remembers stuff! ENTRY (2 nd ENTER) ANS (2 nd (-)) STO   It changes stuff! DEL INS (2 nd DEL) CLEAR

The Home Screen and PEMDAS  PEMDAS rules! Parentheses Exponents Multiply Divide Add Subtract

The Home Screen and PEMDAS  PEMDAS rules! Parentheses Exponents Multiply Divide Add Subtract Parentheses are very, very, very, very, very important!!!

Important Special Keys  ^ (exponentiation)  x 2 (squaring)  x -1 ( multiplicative inverse)   (pi)  e (engineer’s constant)  e x (power of e)   (cursor keys)  (square root)

Discrete Functions: Lists  Standard lists: L 1, L 2, etc  Display like this: { }  Whoops! ERR: INVALID DIM  List Editor: STAT | EDIT  Adding & deleting numbers in lists  Don’t mess with the list names!  But when you do: STAT | SetUpEditor

Discrete Functions: Scatter Plots  Use the STAT Editor to put the “x” and “y” data into two lists (L 1 and L 2, usually)  Press STAT PLOT (2 nd Y=)  Choose a plot (usually #1) to turn on; choose the first type; make sure it specifies the correct lists (L 1 and L 2, usually); choose the first mark  Make sure the other plots are turned off  Press ZOOM, then press 9 (ZoomStat)

Discrete Functions: Scatter Plots  Use WINDOW to adjust the horizontal and vertical extents  Use TRACE to turn on the blinking spider  With TRACE turned on, use the  and  keys to jump the spider from data point to data point.  Use QUIT (2 nd MODE) to get back to the Home screen

Continuous Functions: Equation  Press Y= to access the equation editor  Press  to toggle off any active plots  Choose which slot (Y 1, Y 2, etc.) to use  Turn off other equations by using the  key to move the cursor over the = sign, then press the ENTER key (only active equations with their = sign in bold will be graphed)

Continuous Functions: Table  Use TBLSET (2 nd WINDOW) to prepare a table Set a starting value for the “x” and an increment value Set “Indpnt” and “Depend” to AUTO  Press TABLE  First column is for “x”, other column(s) for any active equations  Use  and  to scroll up and down in the table

Continuous Functions: Table -- OR – If you want to only see the results (“y”) for several specific values of “x”, then  Use TBLSET and specify ASK (instead of AUTO) for the “Indpnt”  Leave everything else the same  Press TABLE  Key in your specific “x” values in the first column

Continuous Functions: Graph If the graph isn’t shown when you press the GRAPH key, then  Press WINDOW and specify appropriate values for X MIN, X MAX  Press ZOOM then 0 (ZoomFit) and the TI-83 will choose appropriate values for Y MIN and Y MAX

Modeling Discrete Data  Put data into lists L 1 and L 2, then display the scatter plot with ZoomStat  Press STAT then  and choose appropriate type of model (LinReg, QuadReg, etc.) then append the equation name Y 1 (press VARS then  then 1 and 1)  Press GRAPH

Questions and Answers Bruce Thomas Mathematics Department Kennesaw State University