Immunoglobulin E is one of the substances that antibodies are made of. High levels are associated with diseases such as hay fever, asthma and eczema. A patient's 'IgE' level might be one of the factors taken into account by a doctor in diagnosing some of these diseases. The problem is to establish a 'normal range' of values for 'IgE' in the general population and to use this to determine how extreme are the 'IgE' levels of 3 patients suspected of having eczema. I - An Introduction to Statistics Assessment of pollution levels can be made using measurements taken from the feathers of birds.
Heavy metals enter the environment from a variety of sources.
Many of these elements accumulate throughout the food chain and reach higher concentrations in some organisms than are found in the environment. Birds can eliminate pollutants either through excretion or by sequestering them in feathers or eggs. Because birds replace feathers at least annually, there should be no age-related difference in the concentrations of pollutants. The Company is located next to a river and is considering introducing a new product. The student is led through an exploration of data sets that include expenditure on advertising, research and development and costs of pollution.