ECON 2200 Chapter Notes - Chapter 7: Simple Random Sample, Central Limit Theorem, Statistic
2 Mar 2017
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To contact the whole population would be time consuming. The cost of studying all the items in a population may be prohibitive. The physical impossibility of checking all items in the population. A sample selected so that each item or person in the population has the same chance of being included. We can select a simple random sample by using a table of random numbers. The items or individuals of the population are arranged in some order. A starting point is selected randomly and then every kth member of the population is selected for the sample. K is calculated as the population size divided by the sample size. When the physical order is related to the population characteristic, then systematic random sampling should not be used. A population is divided into groups, called strata, and a sample is randomly selected for each stratum. It guarantees that each group is represented in the sample.
