**TI-83/TI-84 commands**

**To enter data into a list: **

Press STAT > EDIT, then type all the values in your data set into a single column.

**To clear a list:**

** **Go to the spreadsheet by
pressing STAT > EDIT. Use the up
arrow to place the cursor on the name of the list you want to erase. Press CLEAR, then arrow back down into the
list.

**To find descriptive statistics:**

First, enter the data into a
list. Quit to the home screen. Then press STAT > CALC 1:1-var stats and
hit ENTER. The command is pasted onto
the home screen, and enter the name of the list where your data is.

**To make a
graphical display:**

All the statistical graphs are under
2^{nd} STATPLOT. You must turn
on the graph you want, select the appropriate type of graph and enter the
correct list. Then press either GRAPH
or ZOOM 9: Zoom stat to see your graph.

What if you get an error? Check that the graph is turned on, make sure no other graphs are on (including on the Y = screen), make sure you’ve entered the correct list, in the case of a scatter plot make sure both the X and Y lists have the same number of values, try hitting ZOOM 9 because sometimes it just needs to be recentered.

**To find values
from the Normal Distribution:**

** 1.
**If you know an interval and are looking for area (percentage), use 2^{nd}
DISTR 2:normalcdf and hit ENTER. This pastes it onto the home screen. You must then enter as follows:

Normalcdf(*lowerbound*,*upperbound*,μ,σ) then hit ENTER

Remember that μ is the mean of the normal distribution and σ is its standard deviation.

2.
If you know the area and are looking for values along the
horizontal (i.e. percentiles) use 2^{nd} DISTR 3:invNorm and hit
ENTER. This pastes it to the home
screen. You must then enter as follows:

InvNorm(*Area to the left* *of
the value you have,*μ,σ)
then hit ENTER.

**To find the correlation coefficient:**

First, your calculator must be set
up to display the correlation. (You
only have to set it up once, so if you’ve done it in class, skip this
part. Sometimes if you change batteries
you have to do it again.) Hit 2^{nd}
CATALOG (this is over the 0 button). Go
down to DiagnosticOn, hit ENTER then ENTER again. It is now set up to display correlation with the regression line.

Enter the X values in one list and the Y values in another. Go to STAT>CALC 8:LinReg (a+bx) and hit ENTER. It is now pasted to the home screen. You must input the names of the list containing the X values followed by a comma then the list containing the Y values. For example, if my X values are in L1 and Y values are in L2, I would enter

LinReg(a+bx) L1,L2