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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="">
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.
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