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.
Hives or urticaria is one of the skin conditions that may cause itchy bumps all over body. Hives is a sudden outbreak of swollen, pale red bumps on the skin. These bumps or plagues sometimes result from allergic reactions. This condition causes burn, sting and itchiness. The bumps caused by hives can appear on your face, tongue, lips, ears, throator any other part of the body. Hives are in different sizes and sometimes several hives join together to form plagues. They last between hours to a day on your skin and then clear.