Suppose that n = 100 i.i.d. observations for (Y, X) yield the following regression results: Ŷ 32.1 + 66.8X, SER = 15.1, R² = 0.81. = (15.1) (12.2) Another researcher is interested in the same regression, but he makes an error when he enters the data into his regression program: He enters each observation twice, so he has 200 observations (with observation 1 entered twice, observation 2 entered twice, and so forth). a. Using these 200 observations, what results will be produced by his regression program? (Hint: Write the "incorrect" values of the sam- ple means, variances, and covariances of Y and X as functions of the "correct" values. Use these to determine the regression statistics.) Ŷ = X, SER = _R²_ () () b. Which (if any) of the internal validity conditions are violated? عات
Suppose that n = 100 i.i.d. observations for (Y, X) yield the following regression results: Ŷ 32.1 + 66.8X, SER = 15.1, R² = 0.81. = (15.1) (12.2) Another researcher is interested in the same regression, but he makes an error when he enters the data into his regression program: He enters each observation twice, so he has 200 observations (with observation 1 entered twice, observation 2 entered twice, and so forth). a. Using these 200 observations, what results will be produced by his regression program? (Hint: Write the "incorrect" values of the sam- ple means, variances, and covariances of Y and X as functions of the "correct" values. Use these to determine the regression statistics.) Ŷ = X, SER = _R²_ () () b. Which (if any) of the internal validity conditions are violated? عات
MATLAB: An Introduction with Applications
6th Edition
ISBN:9781119256830
Author:Amos Gilat
Publisher:Amos Gilat
Chapter1: Starting With Matlab
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Related questions
Question

Transcribed Image Text:Suppose that n = 100 i.i.d. observations for (Y, X) yield the following
regression results:
Ŷ 32.1 + 66.8X, SER = 15.1, R² = 0.81.
=
(15.1) (12.2)
Another researcher is interested in the same regression, but he makes an
error when he enters the data into his regression program: He enters each
observation twice, so he has 200 observations (with observation 1 entered
twice, observation 2 entered twice, and so forth).
a. Using these 200 observations, what results will be produced by his
regression program? (Hint: Write the "incorrect" values of the sam-
ple means, variances, and covariances of Y and X as functions of the
"correct" values. Use these to determine the regression statistics.)
Ŷ -
X, SER
=
6tc
() ()
b. Which (if any) of the internal validity conditions are violated?
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