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Chapter Three Day Three

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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  1. Chapter Three Day Three Least Squares Regression

  2. Homework • P. 204 29,30,31,32

  3. Regression line requires one variable be an explanatory variable and the other be a response variable. Correlation makes no distinction

  4. 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)

  5. Data

  6. WHO? WHAT? WHY? WHEN, WHERE, HOW and by WHOM? • Who: • What: • Why: • When, where and by whom:

  7. Give the regression line: Interpret the slope: Interpret the y-intercept: Give and interpret the correlation:

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

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