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Variance of a population
Population variance is a measure of how spread out a group of data points is. Specifically, it quantifies the average squared deviation from the mean. So, if all data points are very close to the mean, the variance will be small; if data points are spread out over a wide range, the variance will be larger.
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Give an estimate of this common population variance based on the variance of the sample means given. Give an estimate of this common population variance by pooling the sample variances given
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