Ascientist told his student assistants that he had sorted groups of mice by their intelligence and asked the assistants to assess the groups’ maze-solving abilities. the scientist had not actually sorted the mice by intelligence. the students rated the “highest intelligence” group of mice as the best maze solvers and the “lowest intelligence” group as the worst maze solvers. what was the scientist trying to demonstrate by doing this experiment?
a. experimental subjects should never be put into groups.
b. mice should not be judged by their intelligence.
c. higher intelligence mice are better maze solvers.
d. people can introduce their own biases into an experiment.

As for this problem, the most probable and the most likely answer for this would be D. People can introduce their own biases into an experiment.

Experimental subjects can be put into groups if there is a need for such. This usually covers the control group and the experimental group to see the difference and to prove or disprove a hypothesis. Thus, this is a very popular and common way in conducting experiments with subjects. As for the mice, they aren't being judged since they are only rated through observation. Their intelligence isn't more likely to be always equated to better maze solvers. The last one, on the other hand, gives us that when scientists don't cover up most factors that might influence the experiment and most especially their biases, this might lead to a waste of the experiment and/or a biased result.