TI-84 Functions How-To
1. Calculating Mean, Median, Quartiles, and Standard Deviation
1. Press [STAT]
2. Select Edit… and press [ENTER]
3. Enter your list of data
If you want to order your list do the
following:
a. Press [STAT]
b. Select SortA( and press [ENTER]
c. Enter the List name you want to
Sort
Eg) SortA(L1)
Legend
𝑥̅ − 𝑀𝑒𝑎𝑛
𝑆𝑥 − 𝑆𝑡𝑎𝑛𝑑𝑎𝑟𝑑 𝐷𝑒𝑣𝑖𝑎𝑡𝑖𝑜𝑛 𝑓𝑜𝑟 𝑆𝑎𝑚𝑝𝑙𝑒
𝜎𝑥 − 𝑆𝑡𝑎𝑛𝑑𝑎𝑟𝑑 𝐷𝑒𝑣𝑖𝑎𝑡𝑖𝑜𝑛 𝑓𝑜𝑟 𝑃𝑜𝑝𝑢𝑙𝑎𝑡𝑖𝑜𝑛
𝑛 − 𝑁𝑢𝑚𝑏𝑒𝑟 𝑜𝑓 𝑑𝑎𝑡𝑎
𝑚𝑖𝑛𝑋 − 𝑆𝑚𝑎𝑙𝑙𝑒𝑠𝑡 𝑣𝑎𝑙𝑢𝑒
𝑄1 − 𝐹𝑖𝑟𝑠𝑡 𝑄𝑢𝑎𝑟𝑡𝑖𝑙𝑒
𝑀𝑒𝑑 − 𝑀𝑒𝑑𝑖𝑎𝑛
𝑄3 − 𝑇ℎ𝑖𝑟𝑑 𝑄𝑢𝑎𝑟𝑡𝑖𝑙𝑒
𝑀𝑎𝑥 − 𝐿𝑎𝑟𝑔𝑒𝑠𝑡 𝑣𝑎𝑙𝑢𝑒
4. Press [STAT]
5. Go to tab CALC
6. Select 1-Var Stats (for 1-variable
statistics)
7. Press [ENTER]
2. Graph a Histogram
Setup (Turn on Plot Mode)
1. Click [2ND] -> [STAT PLOT]
2. Select Plot 1 and have the following settings:
 On
 Type: Histogram (Top Right)
3. Click [WINDOW] and have the following settings:
 Xmin = (Your smallest x-value)
 Xmax = (Your largest x-value)
 Xscl = (your bin-width)
 Ymin = 0
Display
1. Click TRACE
3. Grouped Standard Deviation
1.
2.
3.
4.
Press STAT -> Select Edit
Enter your Midpoint in L1, Frequency in L2
Press STAT -> Select Calc tab -> Select 1-Var Stats
Enter the following
List: L1
FreqList: L2
2. Press ENTER
𝑆𝑥 = Sample SD
𝜎𝑥 = Population SD
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4. Correlation Coefficient 𝒓 and 𝒓𝟐
Setup (Turn on the r function)
1. Click [2ND] -> [CATALOG]
2. Look for DiagnosticOn in the list, and then click [ENTER] to select
3. Click [ENTER] again to turn on the function
Calculate
1. Enter data in L1, L2
 L1 – Independent variable
 L2 – Dependent variable
2. Click [STAT]
3. Select tab CALC
4. Select LinReg(ax+b)
5. 𝒓 = … is our Correlation Coefficient
6. 𝒓𝟐 = … is our Correlation of Determination
5. Find Linear & Non-Linear Regression Equation
1. Click [STAT] -> Select Tab CALC -> Select options:
Options
Regression
4:LinReg(ax+b)
Linear with ax+b
5:QuadReg
Quadratic
6:CubicReg
Cubic
7:QuartReg
Quartic
8:LinReg(a+bx)
Linear with a+bx
0:LnReg
Natural Log
A:PwrReg
Power
2. Equations will be shown in terms of a, b, c, …
6. Store Equation
1. Click [STAT] -> Select Tab CALC -> Select any regression
2. On the row Store RegEQ, click [VARS] -> Select tab Y-VARS -> Select
Function…
3. Select the Y (Y1, Y2, …) that you want to store your equation. TI-84 may store up
to 10 equations
7. Graph a Scatter Plot
Setup (Turn on Plot Mode)
1. Click [2ND] -> [STAT PLOT]
2. Select Plot 1 and have the following settings:
 On
 Type: Scatter Plot (Top Left)
To Graph
3. To ensure the correct zoom, click [ZOOM] -> select 9:ZoomStat (This will always help you
graph it)
or
4. Click [GRAPH]
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8. Find intersection of 2 equations
Make sure you stored your two equations
1. Click [Y=] to show your equations in the list
2. Click [2nd] -> [TRACE]
3. Select 5:intersect
4. There are many intersections between 2 graphs, so you must select the range for the
calculator to locate the intersection.
5. Move your first point to the beginning of the range (Left side of the intersection) and
click [ENTER]
6. Move your second point to the ending of the range (Right side of the intersection)
and click [ENTER]
7. Click [ENTER] again to start
8. Intersection coordinate will be displayed at the bottom of the screen.
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