GATE 2024 XH5 (Psychology) – Question 64

Research Methods and Statistics · Statistics in Psychology: Central tendency and dispersion, normal probability curve, parametric and non-parametric tests, effect size and power analysis · 2 marks · Numerical answer

On a standard test, the population is known to have a mean of 500 and a standard deviation of 100. Those receiving an experimental treatment have a mean of 540. The effect size is ________ . (rounded off to two decimal places)

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Correct answer: 0.39 to 0.41

Explanation

Cohen's $d = \frac{540 - 500}{100} = 0.40$.