In a study of cell phones and the risk of brain cancer, researchers studied a group of 469 people with brain cancer. They paired each person who had brain cancer with a person of the same sex, of similar
age, and the same race who did not have brain cancer. Then they compared the cell phone use for
each pair of people. The Journal of the American Medical Association published the results in 2000 in
an article titled "Handheld Cellular Telephone Use and the Risk of Brain Cancer."
Pick the best description of this study:

a. use a computer program to select the locations have a rewards program and those that don't.

Step-by-step explanation:

Randomization refers to an important statistical procedure used to eliminate bias in a study. With randomization, all subjects in the study possess equal chances of being selected. In the study scenario described above, randomly choosing half of their total location to partake in the reward program would involve the use of a technique which isn't liable of introducing bias into the study either deliberately or systematically. The use of store managers or other human in the selection process won't be totally convincing at preventing bias. Hence, a computer program will do.