Perform the indicated operation and reduce to lowest terms. 
Definitions:
Sampling Error
The discrepancy between the statistical characteristics of a sample and those of the population from which the sample was drawn.
Sample Variance
A measure of dispersion that calculates how much the numbers in a sample differ from the mean of the sample.
Unbiased Estimate
An estimator or prediction that, on average, exactly matches the parameter being estimated in the population.
Denominator
The bottom number in a fraction that shows into how many equal parts the whole is divided.
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