Question 22

A health care professional wants to determine whether individuals with hypertension who take Atenololhave significantly lower systolic blood pressure than individuals with hypertension who do not take Atenolol. For individuals who have not been prescribed Atenolol, the population systolic blood pressure mean is 165 (= 165) with a standard deviation of 6.The sample of30 individuals who take Atenololhave an average (mean) systolic blood pressure of 147.On the basis of these data, can the researcher conclude that the Atenololsignificantly lowers systolic blood pressure?

The most appropriate alternative hypothesis (in symbols) would be:

_Atenolol= 165

_Atenolol= 147

_Atenolol< 165

_Atenolol< 147