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Lesson 2: Interpreting scatter plots

# Scatter plot: smokers

In a negative linear association, as one variable goes up, the other variable goes down at a constant rate. In this case, the percent of adults who smoke drops 0.5% each time the year goes up. In the right graph, the points go down by about 0.5% each year. There should be no points far away from the main trend. Created by Sal Khan.

## Want to join the conversation?

• At 00:9, sal says linear association what does that mean?
• The scatter plot looks like a linear function. It is almost a straight line.
• This is hard is there an easier way to do this.??
• Stick with it! You'll get it. What may help is to brush up on basic shapes of functions (ie: linear= straight line, logarithmic, exponential, polynomial, etc). These are taught in Pre-Calc and Calc classes already. A suggestion to Khan Academy might be to do a quick video and practice review section at the beginning of this section to review what linear/ non-linear functions look like in graph (non-scatter) form...and since I suggested it, I'll even do the video if you want me to, just show me the tools and code to upload the wmv. :-)
• anyone from 2022 i understand perfectly
• At , what does Sal mean by an outlier in the graph?
• Something that doesn't fit in with the rest of the points
• Who here is from the year 10239786413?
• me fr
• I'm from India.
I also see some people smoking for a living. Really they should stop.
anyways, nice video! :)
• Me and my monkey
• monky
• Wait so how would you just identify a linear or not linear if 2 look the same like graph 1 and graph 2.