The principle that guides the framing of a null hypothesis is:
A) One either rejects or accepts the null hypothesis on the basis of the evidence at hand.
B) A null hypothesis may be rejected but can never be accepted.
C) One must always reject the null hypothesis unless the evidence is convincingly (determined by the level of significance) to the contrary.
D) One must always accept the null hypothesis unless the evidence is convincingly (determined by the level of significance) to the contrary.
E) There is no guiding scientific principle and the analyst should frame them as he or she sees fit.