Biology 2244A/B Chapter Notes - Chapter 12: Standard Deviation, Binomial Distribution, Categorical Variable
25 Dec 2016
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Distribution: tells us what value a variable takes and how often it takes these values. Categorical variable: this lists categories and gives out or percent of each individual in the category. Population proportion: fraction of the population having the characteristic of interest. N observations are all independent: knowing the result of one observation doesn"t change probabilities we assign to other observations. Each observations falls into just two categories a. P: the probability of success is same for each observation. Ex. delivering n babies, knowing that one is a girl doesn"t change the probability of the next birth so independent. Discrete random variable x: the number of girls, countable number possible outcomes, each outcome is as it appears. Random variable: a variable that cannot be predicted for a particular event, but has a pattern of predictability over multiple trials. Binomial distribution: the count x of successes in the binomial setting has the binomial distribution with parameters n and p.
