Picture and bar graphs

- [Narrator] What you see
here are two different ways

of looking at the same information.

So, for example, if I were to ask you,

and you could look at either

this graph on the left or
this graph on the right,

what type of squirrel do they
find the most of at the park?

What would your answer be?

Well, the way that you
would try to answer that,

let's say you were to look
at this graph on the left,

which is a picture graph.

You might say, "Where
does that name come from?"

Well, it's using pictures.

And these pictures usually
are some type of symbol,

or, in this case, an actual
picture of a squirrel

that shows you the things
that we're counting.

Now, before you even just count

the pictures in the picture graph,

it's important to look at the key here

and make sure that you know
what each squirrel picture,

they almost look like cats here,

what each of these squirrel
pictures represent.

Here, each squirrel
represents one squirrel,

so it's pretty straightforward.

But, it could have been two
squirrels, or three squirrels,

or four and a half squirrels,

which would've been very
strange, but it's one squirrel.

So, if you want to know
which one has the most,

and I guess it would've been

the most regardless of what this key said,

even if it was two squirrels,

you can see just by looking at it,

that you see the most gray squirrels here.

There's the most number of
these little squirrel pictures.

We can actually know exactly

how many gray squirrels there are.

There are 1, 2, 3, 4, 5,
6, 7, 8 of these pictures.

Each of them represent one squirrel,

so there are eight gray squirrels.

Now, we could have also used
this graph at the right.

And this is called a bar graph. Why?

Because you have these bars to show

how much of each type
of squirrel you have.

And so we can make sure we can confirm

that the gray squirrels right over here,

this is also showing that you have eight.

And with a bar graph, this
one has it nicely numbered,

where we see that each
line increases by one.

We go from 1, 2, 3, 4, 5, 6, 7, 8, 9.

Sometimes it's not labeled as neatly,

and sometimes each of these vertical lines

might represent two, or three, or four.

So, it's always good to make sure,

but this one's pretty straightforward.

So, we can see here there
are eight gray squirrels.

Now, these can also be useful
for making comparisons.

So, for example, if I were to say,

"How many more fox squirrels

were found at the park
than red squirrels?"

Well, you could look at either of these.

Let's start with the bar graph here.

We could see the red
squirrels, there's five.

The fox squirrels has
six, so there's one more.

There's one more fox
squirrel than red squirrel.

You can see that here,
the red squirrel, fives.

The red, there are five red squirrels.

And then you can see there
are six fox squirrels.

You could think of this one

as the one that goes above and beyond

the number of red squirrels we have.

So, both picture and bar graphs

can be good ways of thinking
of the quantities you see.

They're good for making comparisons.

They're good for figuring out

just how many of something you see,

or what's the difference,

or even the total of different categories.

Here, it's the squirrel types.

Now, it's also important to realize

what this is not going to tell you.

This isn't necessarily
going to even tell you

the color of the squirrels.

You might say, "Oh
look, this picture graph

looks like this squirrel
is this gray blue color."

No, you can't just assume how it's drawn

is actually what it is.

It's just a symbol.

For example, I'm guessing
that a red squirrel

is more reddish than a gray squirrel,

when maybe a gray
squirrel is more grayish.

But, this doesn't tell
you what they look like.

This doesn't tell you how hard
it was to collect the data.

You don't know how long it took.

You don't know anything else
about the squirrel's behavior,

what they might eat, et cetera.

You just know how many

of each type of squirrel
was found at the park.