(b) In testing hypotheses, if the consequences of rejecting the null hypothesis are very serious, we should 0 A. use a very large level of significance. c B. use a very small level of significance. 0 C. insist that the Pvalue be smaller than the level of signicance. 0 D. insist that the level of significance be smaller than the Pvalue. o A. that there is very good statistical evidence that 30 minutes of aerobic exercise each day provides some im- provement in mental performance