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4 Cards in this Set
- Front
- Back
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Parameter
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A parameter is a number that describes some characteristic of the population. In statistical practice, the value of a parameters is usually not known because we cannot examine the entire population.
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Statistic
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A statistic is a number that describes some characteristic of a sample. The value of a statistic can be computed directly from the sample data. We often use statistics to estimate an unknown parameter.
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Sample distribution
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The sample distribution of a statistic is the distribution of values taken by the statistic in all possible samples of the same size from the same population.
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Unbiased estimator
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A statistic used to estimate a parameter is an unbiased estimated if the mean of its sampling distribution is equal to the true value of the parameter being estimated.
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