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Preliminary analyses indicate that you can consider

the assumptions for using nonpooled​ t-procedures satisfied. Researchers obtained the following data on the number of acute postoperative days in the hospital using the dynamic and static systems. Obtain a 95


95​% confidence interval for the​ difference, mu 1 minus mu 2


μ1−μ2​, between the mean numbers of acute postoperative days in the hospital with the dynamic and static systems.​ (Note: x overbar 1


x1equals


=7.92


7.92​, s 1


s1equals


=1.24


1.24​, x overbar 2


x2equals


=10.17


10.17​, and s 2


s2equals


=3.37


3.37​)

Dynamic

10


10

7


7

9


9

8


8

10


10

6


6

8


8

8


8

7


7

7


7

8


8

7


7

Static

6


6

8


8

11


11

8


8

14


14

14


14

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