It isn't easy to measure a parameter such as the mean height or the mean weight of a population. So, we draw samples from the population and calculate the mean height or mean weight of the individuals in the sample. This sample data acts as a representative measure of the population parameter. These sample statistics are known as estimates.

The estimate for the mean of a sample is denoted by *͞x**,* whereas the mean of the population is designated as ** μ**. Further, parameters such as the mean, proportion, and variance of samples are measured using standard scores, commonly called

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