<span>The printing press allowed mass production of books that spread new scientific ideas.</span>
The study conducted by Dr. Campbell as described is an experimental design, because the researcher controls the variables and measures the results.
<h3>What is an experimental study?</h3>
In an experimental study, the researcher usually divides participants into two groups. One of those groups will be exposed to a new variable. The group that will not be exposed to it is called control group. Then, the results obtained from both groups are compared to see if the variable had any influence over them.
That is precisely what Dr. Campbell is doing, which means he is conducting an experimental design study. His control group uses traditional methods, while the other group is exposed, so to speak, to a new study method. Then, the results of their final exams are compared.
With the information above in mind, we can conclude that Dr. Campbell is conducting an experimental design study.
Learn more about experimental design here:
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Lower people voted for government election
<span>D. Specialization creates better products</span>
Answer: C) id
Explanation:
According to personality theory of Sigmund Freud , id is the feeling that is focused on fulfilling desires that comes into mind for satisfaction.The person usually does not consider act of fulfillment as right or wrong rather just completes his/her urge.
According to the question, Laura is being controlled through id as she is fulfilling her urge of eating second piece of cake not because it is her requirement rather she wants to have it as per her wish .
Other options are incorrect because ego, superego and libido are not the factors that are present in Laura according to the question's scenario. Thus, the correct option is option(C).