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# What is the difference between a point estimate and an interval estimate?

An estimate of a population parameter may be expressed in two ways:

**POINT ESTIMATION**
A point estimate of a population parameter is a single value of a statistic. **For example,**
the sample mean ##barx## is a point estimate of the population mean μ. Similarly, the sample proportion p is a point estimate of the
population proportion P.

**INTERVAL ESTIMATION**
An interval estimate is defined by two numbers, between which a population parameter is said to lie.**For example** a < x < b is an interval estimate of the population mean μ. It indicates that the population mean is greater than a but less than b.

In any estimation problem, we need to obtain both a point estimate and an interval estimate. The point estimate is our best guess of the true value of the parameter, while the interval estimate gives a measure of accuracy of that point estimate by providing an interval that contains plausible values.