Wednesday, January 20, 2010


A sample is a subset of the whole population Typically, the population is very large, making a census of all the values in the population impractical or impossible. The sample represents a subset of manageable size. Samples are collected and statistics are calculated from the samples so that one can make inferences from the sample to the population. This process of collecting information from a sample is referred to as sample. sampling requires 3 major decisions and they are:

  • Who is to be surveyed?
    • Sampling unit
  • How many people should be surveyed?
    • Sample size
  • How should the people in the sample be chosen?
    • Sampling procedure