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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

Chapter Three Day Three

Least Squares Regression


Homework
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
Example variable

  • 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)


Data variable


Who what why when where how and by whom
WHO? WHAT? WHY? WHEN, WHERE, HOW and by WHOM? variable

  • Who:

  • What:

  • Why:

  • When, where and by whom:


Give the regression line: variable

Interpret the slope:

Interpret the y-intercept:

Give and interpret the correlation:


Interpolation is variablethe 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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