Calculator Tips for TI-83 Plus
Box and Whiskers
[STAT] 1
Set window in the first quadrant.
WINDOW change Xmin = 10, Xmax = 50, Ymin = 10, and Ymax = 50
Enter data in L1 Enter the data into the list (see the List card)
To draw a box-and-whisker plot for the data
2nd [STAT PLOT] 1 ENTER
Turn Plot 1 on
ENTER
Highlight the box-and-whisker-plot
▼ ► ► ► ► ENTER Make sure Xlist is L1, then Graph
Box-and-Whisker Plot
To draw the outliers
2nd [STAT PLOT] 2 ENTER
▼ ► ► ► ENTER
Make sure Xlist is L1 ENTER
To find the upper and lower quartiles, the median, and the outliers:
TRACE use ◄ ► to move the cursor along the graph.
Catalog Option
The catalog function is a short cut to calculator options.
ENTER [CALATOG]
The catalog function is automatically in alpha mode so any letter
you specify will take you to the list beginning with that letter
Clearing Out Memory
Clear out RAM memory
2nd + 7, 1, 2
Clearing out all memory
2nd + 7, ► ► ENTER 2
“Resetting all …” will appear on the screen , then,
“TI-83 Plus
1.19
Mem cleared”
Comparing Real Numbers
Suppose you wanted to compare 5/8 and .1468.
Type in 5 8 2nd MATH
Choose one of the logic symbols
Then type .1468 and ENTER
If the response is 1, the comparison is true.
If the response is 0, the comparison is false.
Display Entries (for the coordinate plane)
MODE , FULL, Horiz (splits the display horizontally with
the graph and the table, or the working display )
MODE , FULL, G-T (splits the display vertically with the Graph and the Table)
2nd and ZOOM (the format key), highlight GridOn (turns the grid
on when the graph is displayed) ENTER
2nd and ZOOM (the format key), highlight LabelOn (labels the x
and y when the graph is displayed) ENTER
Fractions
- Use division key / to enter fractions
- Use ( ) to isolate numerator and denominator
Mixed Fractions
Remember to use parenthesis when keying in mixed fractions.
Example: 2 ½ should be entered 2 + ( 1 ÷ 2)
Example: -2 ½ should be entered -2 + ( -1 ÷ 2)
Graphs
- 2nd y= (stat plot), choose plot, turn plot ON, choose graph type,
choose data list, choose mark,
GRAPH
- Set WINDOW or use ZOOM #6, #9, #0
Inequalities
Enter the inequality just as you would an equation
Scroll back using the ◄ ◄ until the \ is highlighted.
For less than press ENTER four times until appears
For greater than press ENTER three times Until appears
Then press GRAPH or ZOOM 6 to display the graphed inequality
Linear Regression
Enter data in List 1 and List 2
STAT, CALC, #4, Enter (defaults L1, L2)
- STAT, CALC, #4, VARS, YVARS, #1, #1,
- Enter(sends equation to y=)
Or
STAT, CALC, #4, Enter (defaults L1, L2)
y=, VARS, 5, EQ
Lists
STAT EDIT to enter data
Data can be entered in one list for:
· Mean, median, mode
· Box-and-whisker plots
· Ordered pairs
· Dilation
· Translation
Mean, Median, and Mode
[STAT] 1
Enter data in L1 Enter the data into the list (see the List card)
STAT ► 1 ENTER ENTER
The mean (average) is identified by x.
Scroll down (about three times) to find the median (middle) which is identified as Med.
To find the mode (most popular or most frequent):
First, sort the list
STAT 2 2nd [L1] ) ENTER
Then, scroll through the data (or list) using the arrow keys and
identify the number most frequently displayed.
Order of Operation
- Use ( and ) to tell the calculator which operation to perform first.
Retrieving Entries
To retrieve a previous entry:
2nd Enter continue pressing this combination until the desired entry is retrieved.
Scatter Plots
- STAT, Enter ▲, Clear Enter
Enter the data
- STAT, Enter
Enter the data
- Turn on the statistical plot
2nd [STAT PLOT]
Enter Enter ▼
Enter ▼ 2nd [L1]
Enter 2nd [L2] Enter
- Graph the data
ZOOM , 9 , Use the TRACE feature and the left and right arrow keys
to move from one point to another.
Simplying Radicals
When simplifying radicals, the largest perfect square is factored out.
Division is used to “factor out” a number from another number.
Use the variable “x” to the second power to represent the perfect square “x2”.
Create an equation for find the highest perfect square.
y = the number under the radical divided by x2
Example: ; y = 24/ x2
Enter the equation in the calculator by:
Look at the answers to this equation in the table.
To find the answer, look for the highest number in X that has a whole number in Y.
(x is your input and y is your output)
Solving Equations
Y=
y1 = Enter the left hand side of the equation
y2 = Enter the right hand side of the equation
2nd graph
scroll using ▼ and ▲ keys looking for y1 and y2 to be equal.
You many have to change your table set options by 2nd TBLSET ▼
assign a number less than 1 (like .5 or .1) in ∆Tbl=.
If you have multiple choice, use the ask option:
2nd TBLSET ▼ ▼ highlight Ask in the Indpnt: option by ► ENTER
2nd graph enter you multiple choices in the table and Enter The calculator will display the answers
for y1 and y2 (remember, they need to be equal).
Square and Square Root
Remember to use parenthesis when squaring a negative number.
Example: for -42 use ( - 4 ) 2
Storing Values
To store or substitute a value in for a variable
Al A
To store 8 in the value in the variable A:
8 STO → ALPHA A ENTER;
Enter the expression using the same valuables used to store the value(s).
Then press ENTER
Tables
- enter equation in y=
- 2nd GRAPH (table) shows x, y table
- 2nd d (TblSet)
- TblStart –(sets table start values)
- ∆ Tbl (sets the increments)
- Ask – allows you to determine the value of x
Calculator Tips for TI-83 Plus