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  • El Salvador hospitals overwhelmed by respiratory diseases
    SAN SALVADOR, El Salvador (AFP) -- Hospitals in El Salvador have been overwhelmed by an unexpected rise in respiratory diseases including pneumonia and dengue fever, health authorities said on Wednesday. The official said acute respiratory disease has shot up, totaling some 1.3 million cases.
STANDARD DEVIATION (SD) PDF Print E-mail
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FREE LESSONS at Avalon Medical Laboratory ONLINE - STATISTICS
Friday, 11 September 2009 19:19

 

STANDARD DEVIATION: (SD) is a measure of the variability or dispersion of a statistical population. A low SD indicates that the data points tend to be very close to the mean, whereas high standard deviation indicates that the data are spread out over a large range of values.

 

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VARIANCE: Applied to a variable or distribution, is the expected square deviation of that variable from its expected value or mean.