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14 Cards in this Set
- Front
- Back
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Variable |
An observed property of the individuals of a population. |
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Parameter |
A calculated property of the individuals of a population. (e.g. ux) |
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Statistic |
A calculated property of the individuals of a population. (e.g. x bars of n, p hats of n) |
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Population distribution of variable |
It's distribution among all individuals of the population. |
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Sampling distribution of a statistic |
It's distribution among all random samples of a given size n. |
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Notations |
1. Symbols w/ subscripts x, y will always indicate parameters |
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Notation 2 |
Symbols w/ subscript n will always indicate stats of samples size n. |
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Notation 3 |
Symbol N will always rep population size |
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Sampling distribution of x bars of n |
[the means of all random samples size n] |
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Ux bars of n= Ux |
[mean of the sample means=population mean] |
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6x bars of n= 6x/square root of n |
[standard dev. of sample means= (population standard deviation/ square root of n] |
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Sampling is normal if... |
[n |
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Central limit theorem |
(Sampling dist of x bars of n is normal if 30 |
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Law of large numbers |
x bars of n---> ux as sample size increases |
