GATE (Graduate Aptitude Test in Engineering) Psychology Research Methods and Statistics-Statistics in Psychology Study Material (Page 2 of 9)

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Frequency Distribution & Skewness: Coefficient of Skewness (SK)


Frequency polygon represents the frequency distribution of discreet variables. Frequency distribution is sometimes only called distribution. For continuous variables, frequency distribution curves are continuous, giving frequency for all possible values. Such frequency distribution curves can be symmetrical of skewed on one side. Curve is symmetrical if mean, median, and mode fall at highest point on the curve.

If the scores are grouped toward eit…

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Measures of Central Tendency: Mean and Median


Measures of Mean, Mode, and Median measure the central tendency. Central tendency on the other hand is the tendency for the values of a random variable to cluster round its mean, mode, or median.


Mean, arithmetic average or arithmetic mean is the average of all scores calculated by dividing sum of scores by number of scores. Therefore in above example, .


When numbers are arranged in the ascending or desc…

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