Sarah investigated the effects of drinking orange juice on vision improvement. One group drank orange juice and the other drank water. Afterwards, both groups took a vision test. The group that drank orange juice had better vision than the water drinking group. Which of the following questions would provide information that would strengthen the conclusion that drinking orange juice improves vision? Question 2 options: Were the groups created by randomly assigning people to their group? Did the participants know the purpose of the study? Both Neither