Question

A medical researcher wants to examine the relationship of the blood pressure of patients before and after a procedure. She takes a sample of people and measures their blood pressure before undergoing the procedure. Afterwards, she takes the same sample of people and measures their blood pressure again. The researcher wants to test if the blood pressure measurements after the procedure are less than the blood pressure measurements before the procedure. The hypotheses are as follows: Null Hypothesis: μ_D ≥ 0, Alternative Hypothesis: μ_D < 0. From her data, the researcher calculates a p-value of 0.0063. What is the appropriate conclusion? The difference was calculated as (after - before).

Question 16 options:

	1) The average difference in blood pressure is significantly different from 0. The blood pressures of patients differ significantly before and after the procedure.
	2) The average difference in blood pressure is greater than or equal to 0.
	3) We did not find enough evidence to say there was a significantly negative average difference in blood pressure
	4) The average difference in blood pressure is significantly less than 0. The blood pressure of patients is higher before the procedure.
	5) The average difference in blood pressure is significantly larger than 0. The blood pressure of patients is higher after the procedure.

Answer 1

The average difference in blood pressure is significantly less than 0. The blood pressure of patients is higher before the procedure.