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Good experimental design includes a hypothesis that isĀ testable and observable.

Answer: testable and observable.

Explanation:

Experimental design includes the concepts which are directly related to the plan which is required to be followed so as to deduce a reasonable outcome. It must include a hypothesis which should be testable and observable on the basis of application of suitable scientific methodology. A hypothesis is presumed statement related to a particular natural phenomena or event which is required to be proved by implementation of scientific experimentation procedure and direct observation.