BIOL361 Lecture Notes - Lecture 5: Probability Distribution, Statistical Population, Random Variable
10 Apr 2016
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Document Summary
X = # of students absent or the weight of the next randomly selected squirrel. Random we don"t know the real value until after the experiment is performed. The probability distribution of a random variable (x) specifies the possible values of x, and tells us how probabilities assigned to them. Random variable that can take any value in an interval of numbers ( a < x < b ) Range of values of x tells us how the probabilities are assigned to the range of those values. P(x) = 1 total area under the curve = 1. 0. 0 < p(x) < 1 every value of x must have a probability between 1 and 0. = gaussian or bell shaped distribution if the distribution of a continuous variable is symmetric and unimodal determined by the mean ( ) and standard deviation ( ) Has mean = 0 and standard deviation = 1 z scores.
