spr09_ex3 - STA 6126 Exam 3 Spring 09 PRINT Name _ True or...

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STA 6126 – Exam 3 – Spring ‘09 PRINT Name ____________ True or False: In linear regression, an observation with a ‘high’ leverage value is one whose dependent variable (Y) is ‘far’ away from the other observations. In simple logistic regression, e β represents how much the odds change multiplicatively when X increases by 1 unit. When we plot the residuals from a linear regression model versus X, and observe a ‘U’- shape, then there is evidence that the relationship between Y and X is not linear. If we fit Backward Elimination with Significance Level to Stay SLS=0.05 and Forward Selection with Significance Level to Enter SLE=0.05, we will always obtain the same selected regression model. When we add new variable(s) to a regression model that do not contribute to the fit using existing variables, it is possible for MSE to increase and Adjusted-R 2 to decrease. In a simple logistic regression, our estimated probability is 0.5 when X = -a/b
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Problems: A county’s population is currently 100,000. If it grows 10% annually, what will be its
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spr09_ex3 - STA 6126 Exam 3 Spring 09 PRINT Name _ True or...

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