In an exploratory study such as this, one problem is defining what the "data" are - - the information we should collect. Also, what should have been done to minimize the effects of experimenter bias on the outcome of the study? What were the dangers of the principal investigator assuming the role of prison superintendent?

The "data " is the subject to study, one way to minimize the effects of the expermienter bias on the putcome of the study is to have thos e variables well defined.

Explanation:

A "data" in a experiment is every information that is got from it, whether is the number of times each subject makes some activity, or stays somehow, etc.

Those are defined as the variables, the less variables the expermiente has, the better, so, it is important that the investigators defined which variables are truly important for the expermient.

What should have done to minimize the effects of the experimenter bias on the outcome of the study?

To try to mantain the variables as the less possible.

What were the dangers of the principal investigator assuimg the role of prison superintendent?

Thatthe main objective of the experiment was discovered and itwould cause repercussions on the principal investigator's well being.