True or False: The following conclusion can be drawn from the confidence interval. We are 99% confident that Xarelto has a significant effect on blood viscosity. O True False

MATLAB: An Introduction with Applications
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Xarelto is a drug that can be used as a blood thinner for patients who have a pulmonary embolism or other blood
clotting condition. Researchers wanted to determine if there was a difference in blood viscosity (measured in
mPA S) that might be attributed to the drug. In a study, a random sample of 7 patients who had a family history
of blood clotting disorders were treated with Xarelto for two months. Their blood viscosity was measured before
and after the treatment. The data are shown the table below:
Blood Viscocity (mPA. S)
Patient
1
2
3
4
5
6
7
y
S
Before
6.7
7.1
5.6
6.9
7.5
6.8
5.7
6.61
0.71
After
4.3
4.6
6.7
4.4
6.0
4.9
5.8
5.24
0.92
Difference After
- Before
-2.4
-2.5
1.1
-2.5
-1.5
-1.9
-0.1
-1.37
1.42
Transcribed Image Text:Xarelto is a drug that can be used as a blood thinner for patients who have a pulmonary embolism or other blood clotting condition. Researchers wanted to determine if there was a difference in blood viscosity (measured in mPA S) that might be attributed to the drug. In a study, a random sample of 7 patients who had a family history of blood clotting disorders were treated with Xarelto for two months. Their blood viscosity was measured before and after the treatment. The data are shown the table below: Blood Viscocity (mPA. S) Patient 1 2 3 4 5 6 7 y S Before 6.7 7.1 5.6 6.9 7.5 6.8 5.7 6.61 0.71 After 4.3 4.6 6.7 4.4 6.0 4.9 5.8 5.24 0.92 Difference After - Before -2.4 -2.5 1.1 -2.5 -1.5 -1.9 -0.1 -1.37 1.42
True or False: The following conclusion can be drawn from the confidence interval.
We are 99% confident that Xarelto has a significant effect on blood viscosity.
True
False
Transcribed Image Text:True or False: The following conclusion can be drawn from the confidence interval. We are 99% confident that Xarelto has a significant effect on blood viscosity. True False
Expert Solution
Confidence interval :

There are paired measures on blood viscosity (i.e., before , after) for same subject of patients. Thus, the paired -t confidence interval need to be used in this situation and it's formula is drawn as shown below

                  C.I=dy±tcrit*sdn 

In this formula, dy = mean of differences 

                         tcrit = Critical value 

                         sd = standard deviation of differences 

                        n = sample size 

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