ch 6 stats vocab
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14 terms
Terms | Definitions |
|---|---|
 random variable | variable which has numerical values that describe the outcomes of some chance process |
| probability distribution of a random variable | a random variable's possible valuesand their probabilities |
| discrete random variable | a variable which has a fixed set of possible values with gaps between |
| variance of a discrete random variable | Var (X) = 〖σ_x〗^2= ∑▒(x_i- μ_x )^2 p_i |
| standard deviation | the square root of the variance. |
| continuous random variable | a random variable which has all values in an interval of numbers |
| independent random variables | knowing whether any event involving X alone tells us nothing about the occurrence of any event involving Y alone |
| binomial setting | binary, independent, number, and success |
| binomial random variable | the count X of success in a binomial setting |
| binomial distribution | the probability distribution of a binomial random variable |
| binomial coefficient | (n¦k)= n!/k!(n-k)! for k = 0, 1, 2, . . . n where |
| geometric setting | binary, independent, trials, and success |
| geometric random variable | the number of trials Y that it takes to get a success in a geometric |
| geometric distribution | the probability distribution of a geometric random variable |
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