in-a-study-on-calcium-supplements-and-blood-pressure-1212-men-were-given-calcium

Question

In a study on calcium supplements and blood pressure, $12$ men were given calcium supplements for $12$ weeks. The differences in diastolic blood pressure (after − before) were ranked, and the sum of positive ranks was $20$ , while the sum of negative ranks was $16$ . The critical value for this test at $alpha equals 0.01$ is $25$ . Should you reject the null hypothesis, and what does this decision mean in the context of the claim?

Accepted Answer

Reject $12$ the calcium supplement likely reduces blood pressure.

Answer

Fail to reject $12$ there is not enough evidence that the calcium supplement reduces blood pressure.

Answer

Reject $12$ the calcium supplement has no effect on blood pressure.

Answer

Fail to reject $12$ the supplement increased blood pressure.