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You wish to know whether people with red hair contract the coronavirus at a lower rate than people with blond hair. You can?t do an experiment, clearly, but you can do an observational study. Which of the following can help you deal with the fact that you can?t use randomization to reduce the influence of confounding variables? a) Ensuring a balanced design with an equal number of red and blond haired individuals b) Including a few brown haired individuals c) Getting as large a sample as possible d) Matching pairs of blond and red haired individuals by things like age, sex, height, weight, location, etc

You wish to know whether people with red hair contract the coronavirus at a lower rate than people with blond hair. You can?t do an experiment, clearly, but you can do an observational study. Which of the following can help you deal with the fact that you can?t use randomization to reduce the influence of confounding variables? a) Ensuring a balanced design with an equal number of red and blond haired individuals b) Including a few brown haired individuals c) Getting as large a sample as possible d) Matching pairs of blond and red haired individuals by things like age, sex, height, weight, location, etc

Holt Mcdougal Larson Pre-algebra: Student Edition 2012
Holt Mcdougal Larson Pre-algebra: Student Edition 2012
1st Edition
ISBN:9780547587776
Author:HOLT MCDOUGAL
Publisher:HOLT MCDOUGAL
Chapter11: Data Analysis And Probability
Section: Chapter Questions
Problem 8CR
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 You wish to know whether people with red hair contract the coronavirus at a lower rate than people with blond hair. You can?t do an experiment, clearly, but you can do an observational study. Which of the following can help you deal with the fact that you can?t use randomization to reduce the influence of confounding variables?

a) Ensuring a balanced design with an equal number of red and blond haired individuals

b) Including a few brown haired individuals

c) Getting as large a sample as possible

d) Matching pairs of blond and red haired individuals by things like age, sex, height, weight, location, etc

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