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
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
6th Edition
ISBN:9781119256830
Author:Amos Gilat
Publisher:Amos Gilat
Chapter1: Starting With Matlab
Section: Chapter Questions
Problem 1P
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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
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
In this formula, = mean of differences
tcrit = Critical value
sd = standard deviation of differences
n = sample size
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