GATE (Graduate Aptitude Test in Engineering) Psychology Research Methods and Statistics-Statistics in Psychology Study Material (Page 5 of 9)

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# Measures of Variation or Dispersion: Bias and Measures of Relative Dispersion

There is a very closely related concept of bias, in applications involving measurements. Bias is the tendency of the system to provide incorrect measurements offset towards one side. If the same measurement is repeated, variance in the measurement represents the error in measurement. However, it is very difficult to detect bias in measurement, since mean of measurements also shifts towards the bias. To detect bias some kind of control has to be established.

## Measures of Relative Dispersion

Most commonly used measure is Coefficient of Variation (CV) , which is defined as

. As standard deviation and …

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# Statistical Tests in Psychology: Important Statistical Tests

## Important Statistical Tests

- Parametric Tests
**Student՚s t-test**: A t-test is any statistical hypothesis test in which the test statistic follows a Student՚s t-distribution if the null hypothesis is supported**Analysis of Variance (ANOVA)**: Analysis of variance (ANOVA) is a collection of statistical models, and their associated procedures, in which the observed variance is partitioned into components due to different sources of variation__ANCOVA (Analysis of Covariance)__: Analysis of covariance (ANCOVA) is a general linear model with one continuous outcome variable (quantitative) and one or more factor variables (qualitative) . ANCOVA is a merger of ANOVA and regression for continuo…

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