A population distribution in which many people live in a small area of closely spaced houses or communities.
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The population mean is the mean value of the entire population. Contrast this with sample mean, which is the mean value of a sample of the population.
The sample mean is an unbiased estimator of the population mean because the average of all the possible sample means of size n is equal to the population mean.
A decrease in overall population/population density.
The sample mean will seldom be the same as the population mean due to sampling error. See the related link.
A point estimate of a population parameter is a single value of a statistic. For example, the sample mean x is a point estimate of the population mean μ. Similarly, the sample proportion p is a point estimate of the population proportion P.