Big Ideas Math A Bridge To Success Algebra 1: Student Edition 2015
Big Ideas Math A Bridge To Success Algebra 1: Student Edition 2015
1st Edition
ISBN: 9781680331141
Author: HOUGHTON MIFFLIN HARCOURT
Publisher: Houghton Mifflin Harcourt
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Question
(1) A simple linear regression of Y on X reveals that the
slope b is 3; the standard deviation of X is 2; and the
standard deviation of Y is 8. What is the correlation
coefficient between X and Y? Show steps.
(2) Suppose party affiliation has four categories:
Democrats, Republicans, Libertarians, and Others. If we
include party affiliation as an independent variable in a
regression model, how many dummy variables are needed
to represent the party affiliation in the model? Define the
dummy variables for the party affiliation.
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Transcribed Image Text:(1) A simple linear regression of Y on X reveals that the slope b is 3; the standard deviation of X is 2; and the standard deviation of Y is 8. What is the correlation coefficient between X and Y? Show steps. (2) Suppose party affiliation has four categories: Democrats, Republicans, Libertarians, and Others. If we include party affiliation as an independent variable in a regression model, how many dummy variables are needed to represent the party affiliation in the model? Define the dummy variables for the party affiliation.
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