Fitting Lines to Data
Pre-Algebra · Flashcards
PRE-ALGEBRA · FLASHCARDS
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QUESTION
When is a straight trend line a poor model for a scatter plot?
QUESTION
The trend line
y
=
−
1.5
x
+
40
y = -1.5x + 40
y
=
−
1.5
x
+
40
models liters of water
y
y
y
left in a tank after
x
x
x
hours. By how much does the predicted amount drop in 4 hours?
QUESTION
What is extrapolation, and why is it risky?
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ANSWER
Using a trend line to predict far outside the range of the data. The trend may not continue there.
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