GATE (Graduate Aptitude Test in Engineering) Psychology Research Methods and Statistics-Designing Research Study Material (Page 5 of 7)

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Variables: Mediator vs. Moderator Variables

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Mediator vs. Moderator Variables

Moderator Variables: A moderator is a qualitative (e. g. , sex, race, class) or quantitative (e. g. , level of reward) variable that affects the direction and/or strength of the relation between an independent or predictor variable and a depend…

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Sampling: Types of Samples

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Sampling

Sampling and Its Types

Selection of whole part of an aggregate of material to represent the whole aggregate is known as sampling. Sampling, a long established practice helps evaluate, recognize, and select for taking decisions.

Sample vs. Population

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Types of Samples

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Types of Samples

Probability Sampling (Representative Samples)

The aim of this kind of sampling is to represent the population- in composition and characteristics interesting for the research. Every item in the universe has a known chance or probability of being selected as sample. Sampling operation is so objective that items are selected with some degree of randomness. For example, sample can be representative in terms of age, gender, schooling, economic status, and so on. It therefore provides most valid or credible results.

Probability sampling removes bi…

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