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.
Digestive disorders, thyroid problems, drug reactions and certain cancers are the four main causes of rashes that spread all over the body. Digestive Disorders. There are a number of digestive system disorders that can lead to a full body rash. These include liver disease, kidney problems and Celiac disease. Both the liver and kidneys are responsible for cleaning toxic substances out of the bloodstream. If either of thes. e organs is having problems, those substances can build up and cause a rash to break out all over the body. Severe kidney problems can arise after experiencing direct damage to the kidneys, from having a condition that impairs blood flow or from blockages within the kidneysâ drainage tubes or ureters, that can prevent waste from leaving the body.