One Hundred Fifty People Who Live in Houston Volunteered to Participate

Multiple Choice

One hundred fifty people who live in Houston volunteered to participate in a statistical study. The volunteers were divided into two groups, with people who have children in group 1 and people who do not have children in group 2. Those in group 1 were asked to eat a lemon slice daily for five months. Those in group 2 were asked not to eat a lemon for five months. At the end of the study it was found that on average, people in group 1 were sick less often than those in group 2. Did the study use a random selection from some population? Did the study use random assignment to experimental groups?

A) The study used random selection and random assignment.
B) The study did not use random selection and random assignment.
C) The study used random selection but did not use random assignment.
D) The study used random assignment but did not use random selection.