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## Get ready for 3rd grade

# Creating a bar graph

AP.STATS:

UNC‑1 (EU)

, UNC‑1.C (LO)

, UNC‑1.C.1 (EK)

, UNC‑1.C.2 (EK)

CCSS.Math: Sal creates a bar chart using data from a survey. Created by Sal Khan.

## Want to join the conversation?

- In a bar graph if you don't display all the data, is the problem still incorrect?(16 votes)
- From what I know, yes. The answer is incorrect if you don't have all the data on the graph(10 votes)

- can you do half numbers?(14 votes)
- Another reason to do halves is if there's a certain pattern. For example, if there's a bar chart that counts by even numbers 2-10 and the question tells you to plot 3 and 7, you can just put 3 between 2 and 4 and 7 between 6 and 8.(10 votes)

- what is quantative(9 votes)
- When something is quantitative it means that it can be represented as a quantity, which is to say a number. In the case of statistics a variable is quantitative when it deals with numbers.

For example, a teacher's favorite class is chemistry, their favorite class is a categorical variable. But if you say the number of teachers whose favorite class is chemistry is 3, that would be a quantitative variable, because it deals with numbers.(11 votes)

- which side is the x- axis and which is the y- axis?(5 votes)
- The
**x-axis**is the horizontal (side-to-side) line that goes from left to right. In this bar graph, the x-axis is labeled with courses: physics, chemistry, geometry, history, and language.

The**y-axis**if the vertical (up-and-down) line that goes from bottom to top. The y-axis is labeled with numbers to show the number of teachers.

Hope this helps!(10 votes)

- what if the question said 10 teachers physics what would you do?(5 votes)
- If you want to make a bar graph to show 10 teachers. You could say 2 teacher. So, You could draw 5 because 2*5 = 10(5 votes)

- why do you need to make a bar graph for(5 votes)
- Because you can identify what you are graphing.(1 vote)

- Can you use decimals in plot diagrams? Would the be wrong?(3 votes)
- Yes you can use decimals. On a plot diagram each line has a number. You would put 1 2 3 4. For decimals, on one line put 1, the 2nd line leave blank, the 3rd line would be 2. You would see 1 / 2 The / is the line with no number in-between 1 and 2 and that would be 1.5 Add more lines dependent on decimals.

So 2.3 would be 1 / / / / / / / / / 2 / / / / / / / / / / The 3rd / after 2 is 2.3 each / is .1

/ this is a line as the numbers, except you leave it blank. Even if it starts at 2.3 you do not put 2.3 under the line.(5 votes)

- no tego una idea(3 votes)
- what is a bargragh(2 votes)
- A bar graph is a graph to make it easier to read. no one wants to read 5 mice ate five cheases. so insted, they make a bar graph(3 votes)

- How do you use the bar graph on the actual question?(2 votes)
- If you are asking how to create it, you click on the top of the bar and drag up or down.(2 votes)

## Video transcript

20 teachers were asked
about their favorite course. 7 teachers said language. 3 teachers said history. 9 teachers said geometry. 1 teacher said chemistry. 0 teachers said physics. Create a bar chart showing
everyone's favorite courses. So we've got the bar
chart right over here. And let's see what
we need to plot. So it said, 0
teachers said physics, which is surprising
to me since physics is arguably my favorite course. But let's plot
what the data has. So physics-- so right now
it looks like it's halfway between 0 and 1, so
you actually have to bring the physics down to 0. Let's see, chemistry. Let's see, 1 teacher
said chemistry, so we got to bring
chemistry up to 1. Now, 9 teachers said geometry. So geometry, let's
bring that up to nine. 1 teacher said chemistry. Oh, I already read that. History. History. 3 teachers said history, so
let's bring history up to 3. And then language. 7 teachers said language,
so let's move this up to 7. And I think if I didn't
make any careless mistakes, we should be done. Yep. Very good.