What’s the difference between independent variable levels?

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?

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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.