The meaningfulness of experimental results can be evaluated in several ways. A statistically significant result indicates the

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Definite clinical value of the findings for treatment planning

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Mathematical probability that after treatment, changes that occurred in the treatment group did not occur by chance, but were caused by the treatment

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Definite practical value of the findings that the treatment can improve the symptoms of the patients so that they can return to work.

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All a, b, and c

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