Design of Experiments: Variables, Blocking, Factors, and
Effects
Explain the difference between multiple independent
variables and multiple levels of independent variables. Which is better? What
is blocking and how does it reduce “noise”? What is a disadvantage of
blocking? What is a factor? How can the use of factors benefit a design?
Explain main effects and interaction effects. How does a covariate reduce
noise? Describe and explain three trade-offs present in experiments.





