To see if fish oil can help reduce blood pressure, males with high blood pressure were recruited and randomly assigned to different treatments. Seven of the men were assigned to a 4-week diet that included fish oil. Seven other men were assigned to a 4-week diet that included a mixture of oils that approximated the types of fat in a typical diet. Each man’s blood pressure was measured at the beginning of the study. At the end of the 4 weeks, each volunteer’s blood pressure was measured again and the reduction in diastolic blood pressure was recorded. These differences are shown in the table. Note that a negative value means that the subject’s blood pressure increased.

a. Do these data provide convincing evidence that fish oil helps reduce blood pressure more, on average, than regular oil?

b. Interpret the P-value from part (a) in the context of this study.

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Fish oil 12 10 14 Regular oil -6 1 2 -3 -4 2