TI-83, 84 Calculator Instructions for Statistics:
1. Entering Data
Data points are stored in Lists on the TI-83/84. If you haven't used the calculator before, you
may want to get rid of everything that was there. You do this by pressing 2nd [MEM] (above
the + sign), select [4:ClrAllLists] and press ENTER twice.
Then press STAT and highlight [5:SetUpEditor] and press ENTER twice. You will not have
to do this every time that you want to enter a list, but it's a good idea to do it every once in a
while.
Press STAT, select [EDIT... ] this puts you into the List Editor. You will see columns with
L1, L2,... going across the top. You can store 6 different sets of data here. Now enter the data
pressing ENTER after each data point. After the last data point press ENTER then QUIT.
The data is now stored in L1. You can store data in any of the other lists by scrolling across
in the list editor.
Sorting Data
Once data has been entered into a list, you can rearrange the list into ascending or descending
order. To sort L1 in ascending order, press STAT, select [2:SortA(], [2nd] [L1], (above the
number 1). Now if you go back into the list editor, the list has been sorted. To sort in
descending order, use the [3:SortD(] function.
2. How to find the mean, standard deviation, and the five-number summary of a data set:
• First enter your data set into one of the lists:
STAT EDIT1: Edit…
This menu takes you to the lists.
If you want to delete the numbers in one of your lists, for example in L1, go up with your
arrow and highlight L1. Then press CLEAR and ENTER.
So enter your data list into one of your lists.
• To find the statistics:
STATCALC1: 1-Var Stats
In your window you should see 1-Var Stats
Now your calculator waits for you to tell where your list is.
So if your data set is in L1, enter L1 (2
nd
key 1). Push ENTER.
• You should see the following statistics:
o
x
mean
o
x
∑
the sum of the data
o
x
2
∑
the sum of the squared data
o Sx standard deviation of the sample
o
σ
x
standard deviation of the population
