Introduction. The standard deviation is a measure of the spread of scores within a set of data. Usually, we are interested in the standard deviation of a population. However, as we are often presented with data from a sample only, we can estimate the population standard deviation from a sample standard deviation.ntroduction. The standard deviation is a measure of the spread of scores within a set of data. Usually, we are interested in the standard deviation of a population. However, as we are often presented with data from a sample only, we can estimate the population standard deviation from a sample standard deviation.
Itching usually results from dry skin, a skin disorder, or an allergic reaction. If the person has no rash or skin abnormalities, the cause may be a drug, an allergic reaction that has internal effects, or a systemic disorder.
For some people, the itching their whole body feels drives them crazy, especially when there is no visible rash or skin reaction that accompanies the itching. If itchy skin is a condition you battle all the time, read on to find out how to make the itching stop once and for all. Causes Of Itching All Over The Body There are many causes of itching all over the body, most of which are temporary.