sta135-8-16 - Chapter 8 Regression Wisdom Linear Regression...

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Chapter 8 Regression Wisdom
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Slide 1- 2 Linear Regression and straight form data Ex) Does the following data for Emperor Penguins have straight form?
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Slide 1- 3 Residual Trends Straight-form data should have scattered uniform residuals with little to no trends. Non-straight form data will have residuals with trends. Penguins Burger King
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Slide 1- 4 Multiple Groups in a Set of Data Here’s an important unstated condition for fitting models: All the data must come from the same group. When we discover that there is more than one group in a regression, you must decide whether the groups should be analyzed separately or together.
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Slide 1- 5 Ex) The graph associates sugar content to the number of calories for cereal arranged by grocery shelf 1, 2, or 3.
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Slide 1- 6 A) Which cereals grouped by shelf have a similar trend as far as sugar content and calories? B) How does shelf 3 differ from the others? Discuss both the slopes and intercepts.
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Doctors and Life Expectancy There is a linear relationship between the square root of Doctors per person and Life Expectancy . What is the correlation value?
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