Prepmonitor

note making for speedy revision

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F-ratio/ Fischer's Ratio:

F= mean sq. of b/w sample/ mean sq. of w/i sample

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Relationship among mean, mode and median:

Mode = 3 Median - 2 Mean

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Coefficient of variance = S.D/Mean × 100

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Z- score = (score - mean)/standard deviation

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Gustav Fechner--> Weber's law

Ernst Weber--> just noticable difference (jnd)

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If you test a monkey, a leopard and a crocodile on their agility based on the ability to climb a tree......

Your test will be reliable but will clearly lack validity!