Dr Kurtz Conducts an Experiment to See If the Odor

Multiple Choice

Dr. Kurtz conducts an experiment to see if the odor of peppermint causes people to walk around a track more quickly than if they smell lavender or no odor at all. The null hypothesis would be that

A) The mean speed of the peppermint condition is the fastest of the three conditions
B) The mean speed of the no odor condition is the fastest of the three conditions
C) One of the conditions is faster than the others
D) There is no difference in the mean speeds of the three conditions