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### Unit 6: Lesson 2

Lesson 2: Plotting data

# Constructing a scatter plot

AP.STATS:
UNC‑1 (EU)
,
UNC‑1.S (LO)
,
UNC‑1.S.1 (EK)
,
UNC‑1.S.2 (EK)
CCSS.Math:
Sal shows how to construct a scatter plot. Created by Sal Khan.

## Want to join the conversation?

• what do you do when you have 3 different things to put on a graf like this
|------------hight
|
|------------hours
|
|------------days
• you create a 3D graph that has an x-axis, an y-axis, and an z-axis
• I know how to construct a scatter plot but, I have no clue how to "make appropriate scatter plots" I keep getting it wrong. Im not sure how to do that.
• In a good scatterplot, the points make good use of the space on the coordinate grid (for example, the points are not all “bunched up” in a small portion of the grid). Also, the independent variable should be on the horizontal axis, and the dependent variable should be on the vertical axis.

Have a blessed, wonderful day!
• How do you find the equation for the line of best fit?
• Try to eyeball a line that goes through the "middle of all the points", drawing it on the graph. Once you've done that, find the slope using the rise and run of the points on that line. Locate the y-intercept as well. Finally, arrange the data into y = mx + b form.

Hope this helps!😊
• how do you do a 2 way plot
• A scatter plot is just random numbers on a plot.That is what I am learning lmao.
(1 vote)
• It is not actually random numbers on a plot. For example, the question in the video shows how each class performed on average. The plot is a good way to visually see which class did the best on average. You can quickly see that Spanish was the highest dot and that Computer Science was the lowest dot. Often times, scatterplots are the best way to see trends. This example did not show any trends; because it was organized quite randomly. If the data was rearranged by least score to highest score on the x-axis, you will be able to see an upward trend on which period performed the best. Statistics are actually much more useful in real life than some of the other math you learn. Although you weren't asking a question, I hope this still informs you on why scatter plots exist :)
• If you have a bunch of random dots everywhere and then some clusters in some random places,what would you call that?
• I don't know if there's a name for it, but the clusters suggest that some 𝑥-values are more frequent than others, and for those 𝑥-values some 𝑦-values are more frequent than others.
These clusters have a greater impact on the regression than the surrounding dots, but since you say the clusters are also randomly strewn we should still have a weak linear regression.

Comparing people's heights to the number of shoes they own could potentially produce a pattern like this, with one cluster forming around the intersection of the average female height and the average number of shoes per female, and another cluster around the intersection of the average male height and the average number of shoes per male.
(1 vote)
• How do you know where to plot the points?
• Use the information on the table as X and Y coordinates -- if there is no key, which there should be, the independent variable goes on the X-axis, and the dependent on the Y-axis. Then plot the respective X and Y coordinates.
• What do you do if there are two points on the same spot on a graph?
• i think that you put them on the same point and they affect the average(mean), median, and mode.
(1 vote)
• Are scatterplots just like graphs?
(1 vote)
• Yes, scatterplots show raw data, and the directions and flow in them allow us to see trends and make predictions.