A doctor is interested in how exercise affects sleep, so she conducts an experiment. 30 healthy individuals are randomly assigned to three groups: light exercise, moderate exercise, and heavy exercise. To collect her data, she has the light exercise group come in to her facility in the morning to perform the routine. Then she has the moderate exercise group perform the routine after lunch. Finally, the heavy exercise group performs their routine in the late afternoon. She records the number of hours each participant sleeps that night.

a) What type of experimental design is this?

b) What is/are the factor(s)?

c) What are the levels of any factors from part b?

d) What control issue(s) is/are present in this design?

e) What are the null and alternative hypotheses for this design?