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Phoebe gathers data and estimates many di¤erent regression models. All of them suggest that children who have more books at home have fewer cavities. Phoebe doesn’t think this result is important because: a.) There is clearly selection bias, kids who have lots of books at come from higher income and better educated families. b.) The data on cavities is certainly heteroskedastic c.) Phoebe only used ordinary least squares in her model, should have used weighted least squares d.) Phoebe didn’t use a high enough con…dence level

Phoebe gathers data and estimates many di¤erent regression models. All of them suggest that children who have more books at home have fewer cavities. Phoebe doesn’t think this result is important because: a.) There is clearly selection bias, kids who have lots of books at come from higher income and better educated families. b.) The data on cavities is certainly heteroskedastic c.) Phoebe only used ordinary least squares in her model, should have used weighted least squares d.) Phoebe didn’t use a high enough con…dence level

MATLAB: An Introduction with Applications
MATLAB: An Introduction with Applications
6th Edition
ISBN:9781119256830
Author:Amos Gilat
Publisher:Amos Gilat
Chapter1: Starting With Matlab
Section: Chapter Questions
Problem 1P
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Phoebe gathers data and estimates many di¤erent regression models. All of them suggest that children who have more books at home have fewer cavities. Phoebe doesn’t think this result is important because:

a.) There is clearly selection bias, kids who have lots of books at come from higher income and better educated families.
b.) The data on cavities is certainly heteroskedastic
c.) Phoebe only used ordinary least squares in her model, should have used weighted least squares
d.) Phoebe didn’t use a high enough con…dence level

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