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MATH 225N Week 6 Discussion Confidence Interval, MATH225N: Statistical Reasoning for the Health Sciences, Chamberlain College of Nursing$7.99
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Week 6 Confidence Interval Discussion
According to Holmes, A. and Dean, S. (2019), a confidence level is the probability that the value
of a parameter falls within a specified range of values. A confidence level refers to the
percentage of all possible samples that can be expected to include the true population parameter.
The narrower a confidence interval, the smaller the chance of an observation within that interval.
This actually makes the accuracy level higher. The higher the confidence level the wide the
interval and the more accurate it will be.
In the article by Beautler, E., & Waalen, J. (2006), they were trying to determine the lower limit
of normal hemoglobin for men and women. They categorized even further by dividing it into
white and black men and women. The study conducted stated that a hemoglobin concentration
below 13.7 g/dL in a white man aged between 20 and 60 years would have only an
approximately 5% chance of being a normal value. For older men, this hemoglobin value would
be 13.2 g/dL. The value for women of all ages would be 12.2 g/dL. The study demonstrated that
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in all African American’s, it is lower. See the following CI interval table provided in the study.
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Changing the CI from 90 to 95% would greatly affect how we would treat the patient and the
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decision levels at which transfusion is required. If course, transfusion cannot only be based on
CI or numbers. One must determine the persons normal, level of functionality, co-morbidities,
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baseline, symptomology, race, location, and more before initiating transfusion. These findings
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would all need to be included in the presentation to a facility before a policy or protocol could be
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initiated.
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Beutler, E., & Waalen, J. (2006). The definition of anemia: what is the lower limit of normal of
the blood hemoglobin concentration?. Blood, 107(5), 1747–1750. doi:10.1182/blood-2005-07-
3046
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