What is the primary reason a scientific theory is considered weakened when a hypothesis derived from it is disconfirmed in a systematic empirical study?

A psychologist proposes a theory about the role of sleep in memory consolidation and derives a specific hypothesis: participants who sleep for eight hours after studying will recall significantly more words than those who stay awake. A carefully controlled experiment finds no significant difference in recall between the two groups. Based on this single disconfirmed hypothesis, the theory must be completely abandoned because it has been proven false.

Arrange the following steps in the correct order to illustrate how a specific psychological study leads to the weakening of a scientific theory.

A researcher conducts a systematic empirical study to test a specific psychological theory, but the results fail to support the derived hypothesis. Match each element of this research scenario to its logical role in the process of weakening the scientific theory.

In the context of scientific evaluation, a theory is considered weakened if a hypothesis derived from it is disconfirmed in a systematic empirical study.

A researcher uses a theory of memory to predict that 'repetition always improves recall,' but a systematic empirical study finds that repetition actually hinders recall for complex tasks. Why is this theory now considered 'weakened'?

A researcher conducts a systematic empirical study and finds that the results disconfirm the hypothesis. In this situation, the most scientifically sound evaluation of the theory's current status is that it has been _____ because it failed to account for the newly observed phenomenon.