A researcher who attributes all successes to his treatment but then attributes all failures to another factor has violated which essential criterion for acceptable hypotheses?

Question

Quizplus · Accepted Answer

The researcher has violated the essential criterion of falsifiability, which means that the hypothesis must be testable and have the potential to be proven false. The researcher's bias towards attributing all successes to the treatment and all failures to another factor makes it impossible to disprove the hypothesis and therefore violates the principle of falsifiability.

A Researcher Who Attributes All Successes to His Treatment but Then