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.
If you monitor your practice run you can see how much your improved time wise.
<span>From the following choices, a physical pain that can be considered as an effect of stress is the chest pain. Although other choices can also be effects of stress, they are not physical in nature. Other effects of stress include headaches, elevated blood pressure, trouble sleeping, etc. These pain may be the causes to some other more serious illnesses. </span>
