Texas Instruments TI-84 Plus Reference Sheet

TI-84 PLUS CALCULATOR REFERENCE SHEET
1) Graphing a Function (linear, quadratic, exponential or absolute value)
a. Press y= and enter as many functions as you wish to graph
b. Press graph to see the actual graphs
nd
c. Press 2
d. Press zoom to adjust the view of the graph.
i. #6 will always take you back to a normal 10x10 grid
ii. #0 is the option for making the graph fit the data
iii. #9 is used to see a statistics graph (scatter or residual)
e. Press window to manually change the x or y-axis to fit the data or region you
want to view. This is very helpful when graphing a select interval
2) Entering x/y values from a table or graph to find the equation of the function
a. Press stat, then edit. Enter all of your x-values in L1 and your y-values in L2
b. If you need to clear your lists from a prior problem, go up to highlight the L1
or L2, then press CLEAR and ENTER. This will erase the information
c. Once you've entered the data, you will go to STAT, go across to CALC and
pick your option based on the type of function
i. For linear, choose option #4 LinReg(ax+b). Depending on the model of
the calculator you have, you may enter once or more until it calculates
the data providing you with the a-value and the b-value. The a-value
is the m or slope of your equation. The b-value is your y-intercept
ii. For quadratic, choose option #5 QuadReg. Again depending on your
model will depend on the number of times you press enter. The
calculator provides you the a, b and c values for your ax
quadratic function
iii. For exponential, choose option #0 ExpReg. Enter as many times as
necessary. This provides you with an a and b value to place into
y=a*b
3) Plotting Scatter Plots, Finding the Line of Best Fit and Calculating the
Correlation Coefficient
a. Make sure your diagnostics are ON. Do this by pressing 2
Scroll down to DIAGNOSTIC ON, press enter twice until you see DONE
appear
b. Next go to STAT, EDIT and enter your data into your lists. See above for
steps to clear the lists. Once you have entered all the data, you can
calculate the line of best fit by following steps 2ci from above which show
how to calculate LinReg. One addition will be the R value value which appears
on that screen. This is your correlation coefficient. Remember the closer
then graph (table) to view the table of values
x
2
+bx+c
nd
then 0 (catalog).