Question

A new cream was developed to reduce the irritation caused by poison ivy. To test the effectiveness, researchers placed an ad online asking for volunteers to participate in the study. One hundred subjects

replied and were informed that one group would receive the new cream and the other would receive a cream with no active ingredient. All 100 subjects were
exposed to poison ivy. Fifty were then randomly assigned to the group with the new cream, and 50 were randomly assigned to the group with the cream
with no active ingredient. After three days, the subjects' level of irritation was measured.
Which of the following statements is true about the
benefits of random assignment?

O The variability between each subject may not be
evenly distributed between the two groups, so any observed differences in the level of irritation between the two groups would not be due to the new cream.

O The variability between each subject would be
evenly distributed between the two groups, so any observed differences in the level of irritation between the two groups are more likely due to the new cream.

O The variability between each type of cream would
be evenly distributed between the two groups, so any observed differences in the level of irritation between the two groups are guaranteed to be due to the subiects.

Answer 1

B. The variability between each subject would be evenly distributed between the two groups, so any observed differences in the level of irritation between the two groups are more likely due to the new cream.

Explanation:

Statistics Edg. 2023

Answer 2

2

Explanation:

Because the people were randomly assigned to one of the two groups, there is a randomness to both groups making them the same. The group that doesn't get the cream is a control group so any differences observed between the control and the group being tested would be due to the cream.