GATE (Graduate Aptitude Test in Engineering) Psychology Research Methods and Statistics-Statistics in Psychology Study Material (Page 6 of 9)

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Sampling Techniques: Laws of Statistics

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Selection of part of an aggregate to represent the whole aggregate is known as sampling. Sampling, a long established practice that helps in evaluating, recognizing, and selecting candidates from the universe for taking decisions.

The aim of sampling is to select a set of items (or individuals) which represent the entire population.

Laws of Statistics

Statistics enables drawing conclusions about entire population based on sampled data. It checks validity of sampling, understand…

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Sampling Techniques: Sample Size and Sampling Fraction

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Sample Size and Sampling Fraction

Sampling involves a compromise between precision and economy of the effort. The smaller the sample, and to a lesser extent, the smaller the sampling fraction, the wider the margin of error of any estimate made from it. In fact, if the margin of error that can be tolerated for a particular purpose is known, it is possible to calculate the minimum sample size required. Standard error of mean of the samples, . Where is the standard deviation of the population and is the sample size. As increases standard error of mean decreases th…

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