In the regression model

Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter7: Analytic Trigonometry
Section7.6: The Inverse Trigonometric Functions
Problem 91E
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In the regression model
Y, = a, +aX, +a,D, +a,(X,*D,)+u,
X is a continuous variable and D is dummy variable.
What is a3 ?
a. indicates the slope of the regression when D=1.
b. indicates the differences in the slopes of the two regressions.
c. has a standart error that is not normaly distributed even in large samples since D is not normally distributed
variable.
d. has no meaning since (Xi'Di)=0 when Di=0.
Transcribed Image Text:In the regression model Y, = a, +aX, +a,D, +a,(X,*D,)+u, X is a continuous variable and D is dummy variable. What is a3 ? a. indicates the slope of the regression when D=1. b. indicates the differences in the slopes of the two regressions. c. has a standart error that is not normaly distributed even in large samples since D is not normally distributed variable. d. has no meaning since (Xi'Di)=0 when Di=0.
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