# Chapter Three Day Three - PowerPoint PPT Presentation

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Chapter Three Day Three. Least Squares Regression. Homework. P. 204 29,30,31,32. Regression line requires one variable be an explanatory variable and the other be a response variable. Correlation makes no distinction. Example.

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Chapter Three Day Three

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## Chapter Three Day Three

Least Squares Regression

### Homework

• P. 204 29,30,31,32

Regression line requires one variable be an explanatory variable

and the other be a response variable.

Correlation makes no distinction

### Example

• Some people do not gain weight even when they overeat. Perhaps fidgeting and other “nonexercise activity” (NEA) explains why.

• Some people may spontaneously increase nonexercise activity when fed more.

• Researchers deliberately overfed 16 healthy young adults for 8 weeks.

• They measured fat gain (kg) as response to change in NEA (cal)

### WHO? WHAT? WHY? WHEN, WHERE, HOW and by WHOM?

• Who:

• What:

• Why:

• When, where and by whom:

Give the regression line:

Interpret the slope:

Interpret the y-intercept:

Give and interpret the correlation:

Interpolation is the useof a regression line for prediction inside the range of values of the explanatory variable x used to obtain the line.