In a clinical trial of a new drug, subjects are placed in groups as follows: Subjects in Group 1 are each given a placebo containing none of the drug; subjects in Group 2 are each given 10-mg doses of the drug; subjects in Group 3 are each given 20-mg doses of the drug; subjects in Group 4 are each given 50-mg doses of the drug. Consider the group numbers (1, 2, 3, 4) and also consider the drug amounts (0 mg, 10 mg, 20 mg, and 50 mg).7

Complete Classification. In Exercises, determine whether the data described are qualitative or quantitative and also identify their level of measurement. If the data are quantitative, state whether they are continuous or discrete, and give a brief explanation.