If the question asks: “Find the probability if...”

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Presentation transcript:

If the question asks: “Find the probability if...” Does the question say it is normally distributed, or is a mean and a standard deviation given? Yes No Does the question have a population standard deviation or variance? = ? Yes No Is there a sample given in the question? n = ? Yes No Normal distribution Student t distribution Is there an average rate? Poisson distribution Use Poisson tables or excel. Can only 2 things happen, are there a set number of trials? Does the probability of a success remain constant? Binomial distribution Use binomial tables or excel If there are many probabilities, it could be a tree diagram and may have conditional probability. Yes No