To have confidence that the results of the experiment were valid, youd also want to know
A. whether any volunteers had colds at the start of the experiment.
B. whether the volunteers exercised daily.
C. whether the volunteers all worked for the same company.
D. what the volunteers ate during the experiment.
Answer:A
To have confidence that the results of the experiment were valid, youd also want to know
A. whether any volunteers had colds at the start of the experiment. B. whether the volunteers exercised daily. C. whether the volunteers all worked for the same company. D. what the volunteers ate during the experiment.