In a test of a new surgical procedure,the five most respected surgeons in FlatBroke Township were invited to Carver Hospital.Each surgeon was assigned two patients of the same age,gender,and overall health.One patient was operated upon in the old way,and the other in the new way.Both procedures are considered equally safe.The surgery times are shown below: Which test should we use to test for zero difference in mean times? Which test should we use to test for zero difference in mean times?
A)Use the paired t-test.
B)Use the independent samples t-test.
C)Use the independent samples z test.
D)Cannot be sure which test to use without knowing α.

Question

In a test of a new surgical procedure,the five most respected surgeons in FlatBroke Township were invited to Carver Hospital.Each surgeon was assigned two patients of the same age,gender,and overall health.One patient was operated upon in the old way,and the other in the new way.Both procedures are considered equally safe.The surgery times are shown below: Which test should we use to test for zero difference in mean times?  Which test should we use to test for zero difference in mean times?
A)Use the paired t-test. 
B)Use the independent samples t-test. 
C)Use the independent samples z test. 
D)Cannot be sure which test to use without knowing α.

Quizplus · Accepted Answer

Since each surgeon was assigned two patients and the surgeries were performed in two different ways, the data is paired. Therefore, the appropriate test to use is the paired t-test to test for a zero difference in mean times.

In a Test of a New Surgical Procedure,the Five Most