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9 Cards in this Set
- Front
- Back
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What is the range?
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The difference between the largest and the smallest values in the sample data set.
Range = highest # - lowest # |
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What is the Standard deviation?
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Used in the clinical lab to measure precision
s = SQRT [((SUM( x - mean))^2)/n-1] |
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What is variance?
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Indicates how close together or how precise numbers are within a group.
s^2 = ((SUM( x - mean))^2)/n-1 |
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What is coefficient of variation?
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Compares precision for two or more groups of data to determine which has the greatest precision.
- lower CV, the more precise the data. %CV = s/mean |
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What is relative standard deviation?
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RSD = (s/mean)*100
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What are advantages and limitations of the use of the coefficient of variation in evaluating variation in methods and equipment
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Advantage:
-it is a dimensionless number; -useful in comparing data sets with different units and means. Use instead of SD. Disadvantage: -small means that are close to zero. -it can not be used directly to construct confidence intervals for the mean. |
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What percentage value falls within (+/-) 1 SD confidence intervals in a normally distrubuted population?
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68.2%
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What percentage value falls within (+/-) 2 SD confidence intervals in a normally distrubuted population?
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95.5%
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What percentage value falls within (+/-) 3 SD confidence intervals in a normally distrubuted population?
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99.7%
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