A Researcher Wants to Compare the Performance of Three Types

Multiple Choice

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 minutes later they rate their levels of pain. This experiment…

A) has two factors, medication and age.
B) is completely randomized.
C) has one factor (age) blocked by type of medication.
D) uses matched pairs.
E) has one factor (medication) blocked by age.