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Standard Deviation
A statistical measurement of variance or dispersion within a dataset, indicating how spread out the numbers are from the mean.
Standard Error
The standard deviation of the sampling distribution of a statistic, commonly used as an estimate of the accuracy of a sample mean.
Sample Mean
The average of observations collected from a sample, used as an estimate of the population mean.
Observations
Data points or individual pieces of data collected through measurement, study, or research.
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