STAT 3005 Lecture Notes - Lecture 2: American Psychological Association, Exploratory Data Analysis, Stratified Sampling
31 Jan 2018
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Document Summary
Random sampling, the use of chance to select a sample, is the central principle of statistical sampling. A simple random sample (srs) of size n consists of n individuals from the population chosen in such a way that every set of n individuals has an equal chance to be selected. In practice, people use random numbers generated by a computer or calculator to choose samples. If you don"t have technology handy, you can use a table of random digits. A table of random digits is a long string of the digits 0-9. Each entry in the table is equally likely to be any of the 10 digits. The entries are independent of each other, so knowledge of one part of the table gives no information about any other part. Read them two-by-two if the maximum identifier has two digits. Skip duplicate numbers of numbers not given to any subject. Sometimes, there are statistical advantages to using more complex sampling methods.
