Kirk conducts an experiment designed to answer the question, "do boys have higher self-confidence than girls? " what experimental flaw did kirk make?

a) no one had informed consent.
b) there is no way for random assignment to occur.
c) there is no way for random selection.
d) there is no way to define a population.
e) the term "self-confidence" cannot be defined.

e) The term "self-confidence" cannot be defined.

Explanation:

The term self-confidence can be narrowed down to actions that can be measurable, when doing an experiment you have to have something that can be measured, the term "Self confidence" can´t be measured and is subjective, what one people say reflects Self-confidence others wont. The experimental flaw that Kirk made was basing his experiment on subjective terms.

b) the planets year length would be longer

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