Composite Sampling of Liquids and Fluids
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The fat content of milk is determined on a composite sample which is formed from samples using all deliveries during a specified period of time. Milk samples taken at the time of collection are transported to the processing plant and assembled into composites. Since it is a known fact that composite samples provide an unbiased estimate of the population mean, the interest is in comparing the precision of composite sample estimator with that of the individual sample estimator. An important consequence of compositing is the loss of information on individual sample measurements, and hence the loss of information on sample-to-sample variability within a composite. While comparing between individual samples to locate any differences, compositing may add a variance component to the analysis.
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