2.5 scatter plots and lines of best fit€¦ · 02/09/2016 · columbia 6.4 178 gilliam 3.4 130...
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Is everything related with a linear trend?2.5 Scatter Plots and Lines of Best Fit
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http://tinyurl.com/c7ztkh7
http://tinyurl.com/buwgtg7
Real Life Examples of Scatter Plots
http://tinyurl.com/cfzqeea
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Is the best fit always linear?
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Postive Correlation Negative Correlation
No Correlation
Correlation
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Correlation
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Line of Best Fit - a line that best represents the data on a scatter plot.
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County Incidence of Exposure Cancer Death Rate
Clatsop 8.3 210
Columbia 6.4 178
Gilliam 3.4 130
Hood River 3.8 162
Morrow 2.6 130
Portland 11.6 208
Sherman 1.3 114
Umatilla 2.5 147
Wasco 1.6 138
Example 1: There was a toxic waste spill in Oregon and scientists are trying to determine if the amount of exposure can be linked to death rates from cancer by county. Below is the data.
a) Given that the incidence of exposure is 15, find the cancer death rate.
b) Given that the cancer death rate is 300, how much incidence of exposure was there?
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Age 4 5 6 7 8 9 11 12 13 15 16 18 20
Price 6500 7000 5500 5000 4750 3200 3000 2250 2000 1750 1500 1000 750
Example 2: Below are statistics for the price of your car based on its age.
b) Find the line of best fit.
a) Is there a correlation? If so, what kind?
c) If your car is worth $200, how old is it?
d) If your car is 10 years old, what will its value be? (How much couldyou sell your car for when it is 10 years old?)
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