Posted: September 7th, 2015

Multiple independent variables

Please read Jackson, S. L. (2012) Research methods and statistics: A critical thinking approach, Chapter 12 and Trochim, W. M. K., & Donnelly, J. P. (2008) The research methods knowledge base, pages 191-207.

Please answer the questions below:

1. Jackson, even-numbered Chapter Exercises, pp. 335-337.
2. Explain the difference between multiple independent variables and multiple levels of independent variables. Which is better?
3. What is blocking and how does it reduce “noise”? What is a disadvantage of blocking?
4. What is a factor? How can the use of factors benefit a design?
5. Explain main effects and interaction effects.
6. How does a covariate reduce noise?
7. Describe and explain three trade-offs present in experiments.

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