Chapter 18 Problems      AGid      Statistical Modeling: A Fresh Approach (2/e)

Reading Questions.

1.
Is the point of a controlled experiment to create variability or to avoid variability?
2.
What is an experimental variable? In what ways is it the same and in what ways different from an explanatory variable?
3.
What is the purpose of randomization in conducting an experiment? What gets randomized?
4.
Why might blocking be preferred to randomization?
5.
What is the point of matched sampling and instrumental variables?