Welcome to MySecretMathTutor,
for this video we are going to be making a line chart using the Ti-83 or 84 graphing
calculator. The menu for both of those are pretty much
the same so it’ll work for both. Now for the example I’ve already worked out
how to make a line chart by hand, so we’re going to essentially use the same one, but
see how we can take all of our data values, and put them into a calculator instead.
In this example we are going to keep track of how many students are enrolled in a particular
school for a given year. Alright, so let’s go ahead and grab those
calculators and see how this entire process works out.
Alright, so the very first thing we need to do, is take all of our data over here and
put it into the calculator. To do that look for STAT button, its right
underneath the Delete key. And you’ll notice that first option says Edit.
So go ahead and press Enter. We’re going to be putting in the year under
list 1 and students under list 2. So list 1 is selected, let’s go ahead enter
in our years one at a time. 1990, 1992, …
Alright, great, looks like I have all of my years. Press the right arrow button, let’s jump over to that list, and we’ll enter in our enrolled
students. 1103, all the way down.
Alright, perfect. It looks like both of our list are exactly
the same size so chances are, I didn’t miss any data points in there.
Now an other good thing to note is since we are making a line chart we want to make sure
that the data is organized how we want the dots to all be connected.
So when the graphing calculator goes to connect the dots, it will connect the first data value,
to the second one. The second one to the third one.
The third one to the fourth one. And you know, that’s also a really good reason
why we want all of our years ordered from smallest to largest, because that’s exactly how it’s
going to connect things. OK, let’s go ahead and set up our Stat Plots
so we can get a little bit closer to seeing what this thing looks like.
So the Stat Plot is right above your Y=, Press the second button, and then up to Stat
Plot. So second, Stat Plot.
The first plot is usually highlighted, so go ahead and press Enter.
We want to turn this one On, and then tell it that we want a line chart.
So let’s see, on, we’ll press Enter. That looks good.
Press our down arrow key. We’ll press the right one.
Press Enter again. So it’s this one here that says we are actually
wanting a line chart. Xlist and Ylist is just saying where it’s
going to take the data for our x-axis and y-axis.
We usually want time over here for the x-axis, which we put into list 1.
So everything is looking good. The marks, we’ll go ahead and leave these
as a box, so we’ll actually use boxes and connect lines
in between them. Alright, we are almost done.
We just need a few more things to set, we need set our window so that it will actually
encompass all of this data. Alright, so let’s go ahead, press Window.
For the Xmin and Xmax, we want to encompass all of these years.
Well of the of the years are between 1990 and 2008 so let’s use something like 1988
as the smallest year, and 2010 as the largest year.
Neither one of those years are actually on there, I just want to make sure that I get
something a little bit smaller, and a little bit larger than my actual data values.
The scale, if we look at all of our years, they are going up by 2 every time, so every
tick mark let’s make it equal to 2. OK, that looks good.
Onto the y-axis. Those would be our students in this case.
So these values are somewhere between 1000 and our maximum value on here is 1528.
So let’s set the minimum to be let’s say 1000, and the maximum 1600.
That’ll make sure it captures all of that data. And let’s go ahead and set the scale here as every tick mark will equal 100.
Alright, I think we are in good shape. We have our Stat Plots, we have our window,
let’s go ahead and take a peek at this graph. Finally go ahead and hit that Graph button
at the very end. Perfect!
As you can see it’s taken all of those data points, its put lines in between them, and
we have a wonderful line chart. Let’s compare this with what we did by hand
in a different video to make sure that this is an accurate chart.
Alright, everything looking good. We can see that peak at the very beginning,
that dip down below for 1996, and a few other data values after that.
Now if you are ever curious as to what a specific data value is, you can use the Trace button
to walk through all of these individual points. So let’s go ahead and hit that Trace button.
And you’ll see the very first data point is listed, it says its 1990 and there are 1103
students in there. If you press the right or left arrow buttons,
it’ll walk through these data points one at a time, so you can see the other values.
So now I’m over here at 1998, and there is 1345 students.
Alright, and there you go, that’s how you put a line chart into your Ti-83 or 84 calculator.
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