# Chapter 1. Cautions about Correlation and Regression

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Stat Tutor
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1:09

### Question 1.1

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Incorrect. Only linear relationships should be described by a least squares line.
Correct. Only linear relationships should be described by a least squares line.
Incorrect. Try again.
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2:11

### Question 1.2

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Incorrect. Correlation is definitely affected by outliers.
Correct. Correlation is definitely affected by outliers.
Incorrect. Try again.
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### Question 1.3

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Incorrect. This is an incorrect statement.
Correct. This is an incorrect statement.
Incorrect. Try again.
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2:58

### Question 1.4

Incorrect. If an outlier is close to the regression line found without the outlier, then it will not be influential.
Correct. If an outlier is close to the regression line found without the outlier, then it will not be influential.
Incorrect. Try again.
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### Question 1.5

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Incorrect. Since this outlier pulls the location of the line towards it, it is influential.
Correct. Since this outlier pulls the location of the line towards it, it is influential.
Incorrect. Try again.
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4:27

### Question 1.6

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Incorrect. Extrapolation should be avoided because the relationship may be different between X and Y for that X and it will yield an inaccurate prediction.
Correct. Extrapolation should be avoided because the relationship may be different between X and Y for that X and it will yield an inaccurate prediction.
Incorrect. Try again.
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### Question 1.7

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Incorrect. Using an X value outside the range of observed X values is extrapolation.
Correct. Using an X value outside the range of observed X values is extrapolation.
Incorrect. Try again.
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### Question 1.8

Incorrect. Since 2.0 is not within the range of 0.1 to 0.4, using 2.0 to make a prediction is extrapolation.
Correct. Since 2.0 is not within the range of 0.1 to 0.4, using 2.0 to make a prediction is extrapolation.
Incorrect. Try again.
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8:27