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H2 Maths Notes
H2 Maths 6.2 - When Can You Use a Binomial Model?
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Four binomial conditions: fixed n, exactly two outcomes per trial, constant p, and independent trials.
Example that works: 15 light bulbs with constant defect rate 0.05; X = number defective is Bin(15, 0.05).
Example that fails: 3 cards drawn without replacement; p changes from 4/52 to 3/51, so binomial does not apply (use hypergeometric).
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