Biology 2244A/B Study Guide - Final Guide: Contingency Table

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Binomial distribution: categorical variable that fits the independent-trials model (bins). B-binomial outcome (two possible results, success of failure) I-independent samples n- fixed sample size (assigned before experiment) Normal distribution: continuous variable, know information on the parameters: mean ( ) and standard deviation ( ). Sampling distribution: continuous variable, know information on the parameters: mean ( ), standard deviation ( ), and n for a large number of samples. Z = (y - ) / / n standard deviation of the population distribution. Student s t-distribution: continuous variable, know information on the parameter mean ( ), Therefore, we use the sample standard deviation, s. we must know n to determine t statistic and degrees of freedom (df). t = (y - ) / s/ n standard error of the mean. We had a random sample from the population. That observations are dependent from each other (within and between each sample)

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