Inputting a data set into the TI-30X II s

In the following instructions, I will write comments in this font and the stuff from the calculator in a blocky font called Courier. The things the calculator will put on the screen are in black, while the keys you type in will be in red.

First, you want to be in one-variable stat mode. If you are in stat mode, the word STAT shows up on the output screen in small letters.

Step 0: If you don't see the word STAT on your screen, type the following.

[2nd][DATA][ENTER]

This puts you in stat mode. Before you hit enter, the screen should read

1-VAR 2-VAR

and by pressing enter when 1-VAR is underlined, you go into 1-variable statistics mode. You can skip now to Step 2.

Step 1: If you see the word STAT on the screen, type the following.

[2nd][DATA]

What you will see are the words

1-VAR 2-VAR [left][left]

come up on the screen, and then when you scroll left twice, you will see the word

CLRDATA [ENTER]

underlined. That's when you press enter, which clears out any old data you have.

Step 2: Inputting a data set. The two important buttons here are [DATA] and [STATVAR]. [DATA] lets you start inputting data, and when you are finished pressing [STATVAR] will get you to the statistics associated with the data set you just entered.

One variable statistics in the TI-30X II s are input as a frequency table, a value followed by how many times it shows up on the list. Consider the following list.

20, 20, 19, 18, 18, 17, 17, 17, 17, 17, 16, 16, 16, 16, 16, 16, 16, 15, 15,
14, 14, 14, 14, 14, 13, 13, 13, 13, 13, 12, 12, 12, 11, 11, 11, 11, 11,
9, 9, 8, 7, 7, 4, 4, 4,

[DATA]
x1= 20 [down]
frq= 2 [down]
x2= 19 [down]
frq= 1 [down]
x3= 18 [down]
frq= 2 [down]
x4= 17 [down]
frq= 5 [down]
x5= 16 [down]
frq= 7 [down]
x6= 15 [down]
frq= 2 [down]
x7= 14 [down]
frq= 5 [down]
x8= 13 [down]
frq= 5 [down]
x9= 12 [down]
frq= 3 [down]
x10= 11 [down]
frq= 5 [down]
x11= 9 [down]
frq= 2 [down]
x12= 8 [down]
frq= 1 [down]
x13= 7 [down]
frq= 2 [down]
x14= 4 [down]
frq= 3 [down]
x15= [STATVAR]

The screen will go blank, then show the word CALC for a few seconds, then the statistics for the data set appear. You can use the [left] and [right] buttons to look at different statistics. The number that appears is the underlined statistic. On this list, the numbers are as follows.

Step 3: Reading the statistics of the sample. (Or it could be the parameters of the population, depending on how the data set was defined.)

What you will see on the screen is in black, what keys you will press are in red. The only key in these instructions are the left button, but the right button works for scrolling as well.

n x-bar sx sigmax
45 [left]
n x-bar sx sigmax
13.333333... [left]
n x-bar sx sigmax4.073193967 [left]n x-bar sx sigmax
4.027681991 [left]
sum(x) sum(x^2)
600 [left]
sum(x) sum(x^2)
8730

To get out of the screen showing the statistics, press [CLEAR]. If you press [ENTER] instead, the screen will show the equation line with the symbol of the statistic you were looking at added to whatever equation you were just looking at. This will be useful later in the class when we need the average x-bar and one of the standard deviations, either sx or sigmax, for calculating z-scores.

If you have any questions about how to use one-variable mode on the TI-30 X II s, leave a comment or send me an e-mail.