Scatter Plots and Equations of Lines
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|Statistics||Charts, Graphs, and Tables|
It's a niche market.
To see when she'll be able to buy the gloves,
Shana tracks her tips in a scatter plot to see if there's a trend.
Scatter plots display two-variable data and make predictions based on that data.
Shana makes "weeks" her independent variable... the variable that isn't influenced by anything...
and "tips" her dependent variable.
For example, we can see that in week 2, Shana earned about $125...
...and in week 18, she earned about $165. Before taxes.
We can see Shana's tips are increasing, which means there is a Positive Correlation...
...or, as one variable increases so does the other.
Negative Correlation looks like this.
No Correlation looks like this.
Shana uses the line of best fit to predict
that, after 20 weeks, she will make approximately $170.
With the help of her scatter plot, Shana decides
those snake-proof gloves will be a worthy investment...
Which is good, because the twins just walked in for their first haircut.