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.
you itch. -Irritation and allergic reactions: Wool, chemicals, soaps and other substances can irritate the skin. Poison ivy, cosmetics and food allergies can cause body itching. -Drugs: Antibiotics, antifungal drugs or narcotic pain medications can cause widespread, itchy rashes. ... The fatty acids in these foods can be converted by the body into EPA and DHA, although they're not direct sources of these health ...