Preliminary data analyses indicate that you can reasonably consider the assumptions for using pooled t-proceduressatisfied. Perform the required hypothesis test by using either the critical-value approach or the P-value approach asindicated.
-The forced vital capacity (FVC)is often used by physicians to assess a person's ability to move air in and out of their lungs. It is the maximum amount of air that can be exhaled after a deep breath. A
Researcher wants to perform a hypothesis test to determine whether the mean forced vital capacity
For adults who are smokers is less than the mean forced vital capacity for adults who are former
Smokers. He will use a paired sample to determine whether forced vital capacity increases, on
Average, when adults stop smoking.
A)Two tailed
B)Left tailed
C)Right tailed

Question

Preliminary data analyses indicate that you can reasonably consider the assumptions for using pooled t-proceduressatisfied. Perform the required hypothesis test by using either the critical-value approach or the P-value approach asindicated.
-The forced vital capacity (FVC)is often used by physicians to assess a person's ability to move air in and out of their lungs. It is the maximum amount of air that can be exhaled after a deep breath. A
Researcher wants to perform a hypothesis test to determine whether the mean forced vital capacity
For adults who are smokers is less than the mean forced vital capacity for adults who are former
Smokers. He will use a paired sample to determine whether forced vital capacity increases, on
Average, when adults stop smoking. 
A)Two tailed
B)Left tailed
C)Right tailed

Quizplus · Accepted Answer

The researcher is testing whether the mean forced vital capacity for smokers is less than that for former smokers, which is a directional hypothesis indicating a decrease. Therefore, a left-tailed test is appropriate.

Preliminary Data Analyses Indicate That You Can Reasonably Consider the Assumptions