The answer is B because you don’t give vaccinations to unhealthy people
this question is incomplete but I have added The Answer options to your question
a) He does not have a hypothesis.
b) He only has one group. He has not established a comparison
c) He has not measured an outcome.
d) The groups were not equal to begin with.
Answer:
b) He only has one group. He has not established a comparison
Explanation:
A randomized controlled experiment can be defined as an experiment that has two groups which it randomly assigns participants to.
These two groups are:
1.) the experimental group and
2.) The controlled group on whom the study is being performed.
Now Alberti does not have any of these groups we have listed. He performed the testing on the same people before they consumed alcohol and after they consumed alcohol. Therefore this study was not comparative in nature.
1. Puberty
2. Transition between schools
3. Dating
4. Death of a loved one
5. Peer pressure
6. Gangs
7. Violence
8. Domestic abuse
9 suicidal thoughts or actions
During the alarm stage, the effect of stress on the circulatory system shows the blood pressure rises and the blood vessels narrow.
