Hello. Mr. Tarrou here. Let's some continuous data into the TI-NSPIRE and show you how to
do One Var Stats. This will allow you to find Min, Max, Q1, Q3, Medians, Standard Deviation,
all the good stuff that we care about with univariate quantitative data. So we are going
to open up a new document, we are going to add Lists and Spreadsheets. We are going to
come up here and click on the top of column A and call it data. Come down here and let's
put in some basic numbers like 1,2,2,2,3, and let's say 7. Ok Just a few numbers. 1,
2, 2, 2, 3, 7, and let's add one more let's say 9. So with our data entered into list
A, and it easier if you put in a name in here with the TI-NSPRIRE and not just one letter
because then it will ask you if you want to us a column variable or a variable variable.
So data and there we go. Now with that variable highlighted, or this curse in this first column,
let's hit menu, select Statistics, Statistics calculations, and One-Variable Statistics.
Now it will say number of lists, well I just put the data into one list so hit ok. The
X list, what would you like to use? Well it defaults to list A, but we named it...so we
are going to select the arrow, hit 'data. And I just put one list of numbers in with
no...I didn't put any kind of frequency list in so that is going to default to one, and
where would you like your results at. Well, I would like my results in another column,
say column b and hit ok. Voila, there we go. So we have got Title of One Var-Stats. We
have got the mean of that data I just typed in. The sum of all those numbers. Keep going
down we have got the s of x, the standard deviation of the sample is 3.039. The sigma
of x is the standard deviation of the entire population. We pretty much never use this
out of the graphing calculator. We always use Sx because this has a degree of freedom
of n minus one, and the standard deviation of the entire population does not have a degree
of freedom because you supposedly used every element of the population. We had a sample
size of 7. We have the min of 1. Q1 is the value of 2. The median is also 2. Q3 is 7
and the max is 9. And there we have another statistic here which I am not going to be
concerned about. Now let me come over here to column D and put in data AA just because
I want to give it another variable, actually I am going to put in dataf. Now what I am
going to do here, and there really no reason to do this unless the data in your book has
been presented this way, I am going to put a one in and enter. Now see here I put in
three 2's, I am going to put in a 2 one time and go down. 3, let me see what numbers I
had here...3,7, and 9. So, 3, 7, and 9. Now each one of those data points only showed
up once except for the 2 which I put in three times. So I am going to come over and for
E I am going to put freq for frequency. As long as this does not become italicized that
is an acceptable variable name. I am going to say that I had one, the one showed up once.
The two showed up three times, so I am going to put in a frequency of 3. And I put in one
3, one 7, and one 9. So maybe if you have a lot of data and the textbook has shown you
a cleaned up version....telling you how many 1's, how many 2's, how many 3's, and so on.
If you...oops that should be a one and so should that. If you have been given data and
it has been condensed and you were told how many times each piece of data came in or was
presented, then that means that you need a frequency column. This is not very common,
it is very unusual in the statistics books that I use but let's see if we get the same
mean of 3.7 and standard deviation of 3.04. So let's see if I can help you find One Variable
Stats when you are given a frequency column. I am going to go to to dataf, I am going to
select Menu, Statistics, chose Stat Calculations, and do One Var Stats again. We only have one
list of data so that is going to stay a one. We are going to find One Var Stats for 'dataf.
Now frequency list, I am not going to leave that as one because I have a column of frequencies.
Remember that two showed up three times. So I am going to use, as a frequency list, I
am going to chose the column that I labelled 'freq and hit ok. Let's see what we get. One
var stats. The mean was 3.714 and before it was 3.714 so that stayed the same. The S of
x is 3.039, well that is the same as it was before. So, if you are given a list of raw
data and it is just a long list of numbers, then you can just type that data into a column
and do one var stats. If you are given data that has been condensed or simplified, see
here I had to type in three 2's and over here I have only typed in 2 once, so if you have
been given data that has been condensed and organized and then told how many times each
piece of data shows up you can make column named frequency and then do One Var Stats.
But instead of having the frequency set at one, you are going to have the frequency set
at whatever you have named that column with the frequencies in it. Don't forget I could
not do this until I opened up a new document. Once I opened up a new document I added a
spreadsheet page. So, there you go. That is how you do One Var Stats with a TI-NSPIRE
whether you given one long list of numbers or a condensed list of numbers with a frequency
column. You open up a document, add a List and Spreadsheet page, and enter that data,
and do Menu, Statistics, Stat Calculation, One-Var Stats. There you go. I hope that helps
you find One Variable Statistics or calculate One Variable Statistics with a TI-NSPIRE.
Thank you very much. I am Mr. Tarrou. Go Do Your Homework.