About this video
Sal takes survey results from 20 teachers about their favorite course and turns them into a bar graph. He moves each bar to the right height, including bringing the physics bar all the way down to 0.
You'll be able to
- make a bar graph from a list of data.
- set each bar to the height that matches its number.
- show a count of 0 on a bar graph.
Key words
- bar chart (bar graph)
- A graph that uses bars of different heights to show how many there are of each thing.
- survey
- Asking a group of people the same question and writing down their answers.
- plot
- To put the data onto a graph.
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.
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