You want to design an experiment to compare the effectiveness of pepcid ac tablets and alka-seltzer tablets. which of the following facts would be least likely to complicate your experiment and the analysis of your results? a) pepcid ac and alka-seltzer tablets contain different concentrations of the antacid drug. b) pepcid ac and alka-seltzer tablets contain different ingredients. c) the recommended dosage for pepcid ac and alka-seltzer tablets is different. d) pepcid ac and alka-seltzer tablets are sold in different countries throughout the world.