What's the difference between independent variable levels?

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1. Explain the difference between multiple independent variables and multiple levels of independent variables. Which is better?

2. What is blocking and how does it reduce noise?

3. 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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Anonymous
Excellent resource! Really helped me get the gist of things.

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