A researchers wants to design a study to investigate two factors. He has the funding to investigate four levels of factor A and six levels of factor B, using 10 subjects randomly assigned to each of the 24 combinations of the two factors.
a. Explain the difference in how the study would be conducted when both factors have random levels and when both factors have fixed levels.
b. Explain the difference in the types of inferences that. can be made from a study with both factors having random levels and from a study with both factors having fixed levels.
c. Explain the difference in the types of inferences that can be made from a study in which factor A has fixed levels and factor B has random levels and from a study in which both factors have fixed levels.