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21 Cards in this Set
- Front
- Back
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response variable |
Variable that can be explained by the explanatory variable
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Scatter diagram
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Graph that shows the relationship between two quantitative variables.
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Explanatory variable axis on Scatter diagram
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Horizontal
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Response variable axis on Scatter diagram
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Vertical
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Unusual cutoff %
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Less than 5%
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Independent multiplication
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P(e and f) = p(E) * p(f)
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Subjective probability
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Outcome of probability based on personal judgement
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Residual
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Observed - predicted
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Disjoint
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Mutually exclusive
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Conditional probability
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"The probability of event F given event E"
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Permutation or nPr |
Ordered arrangement in which r objects are chosen from n and repetition is not allowed. |
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Combination or nCr |
A collection, without regard to order, in which r objects are chosen from n with r<=n and with repetition |
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Random Variable |
Numerical measure of the outcome of a probability experiment. Value decided by chance.
Denoted by X |
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Probability distribution |
Provides possible values of the random variable and corresponding probabilities (in table, graph or mathematical formula) |
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Probability histogram |
Horizontal = value of the random variable Vertical = probability of each value |
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Standard Deviation of a Discrete Random Variable |
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Binomial Criteria |
1. Experiment is performed a fixed number of times (each rep call a trial)
2. Trials are independent
3. Two possible outcomes (success or failure)
4. Probability of success is the same for each trial |
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Mean of a binomial random variable |
μₓ = np |
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Standard deviation of binomial random variable |
σₓ = sqrt( np (1-p) ) |
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Discrete random variable
vs
Continuous random variable |
Finate number of values
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Infinate number of values |
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Rules for a discrete probability |
1. ΣP(x) = 1
2. 0 ≤ P(x) ≤ 1 |
