a researcher wants to compare the performance of three types of pain relievers in volunteers suffering from arthritis. because people of different ages may suffer arthritis of varying degrees of severity, the subjects are split into two groups: under 60 and over 60. Subjects in each group are randomly assigned to take one of the medications. Twenty minute slater they rate their levels of pain. This experiment....a)uses of matched pairsb) is completely randomizedc) has one factor (medication) blocked by aged) has one factor (age) blocked by type of medicatione) has two factors, medication and age

Then try StudyFetch, the AI-powered platform that can answer your questions and teach you more about it!