Dynamic 5 6 8 4 5 6 7 8 7 10 7 10 Static 7 7 12 7 14 14 The 90% confidence inter
ID: 3295450 • Letter: D
Question
Dynamic
5
6
8
4
5
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7
8
7
10
7
10
Static
7
7
12
7
14
14
The 90% confidence interval is from nothing to nothing. (Round to three decimal places as needed.)
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 90% confidence interval for the difference, 12,between the mean numbers of acute postoperative days in the hospital with the dynamic and static systems. (Note:x overbar 1=6.92,s 1=1.88,x overbar 2=10.17,and s2=3.54)Dynamic
5
6
8
4
5
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8
7
10
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10
Static
7
7
12
7
14
14
Explanation / Answer
The statistical software output for this problem is:
Two sample T confidence interval:
1 : Mean of Dynamic
2 : Mean of Static
1 - 2 : Difference between two means
(without pooled variances)
90% confidence interval results:
Hence,
90% confidence interval will be:
(-6.217, -0.283)
Difference Sample Diff. Std. Err. DF L. Limit U. Limit 1 - 2 -3.25 1.5457256 6.4486366 -6.2166115 -0.28338848Related Questions
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