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point estimate
A point estimate is a single value (statistic) used to estimate a population value (parameter)true apex
I think you mean "perimeter" "parameter" means something completely different
Parameter is any attribute Statistic are the measured values of a parameter. A statistic is a sample value such as the average height of a group of students. A parameter is a functional constant such as the mean of a normal distribution. Statistics are often used to estimate parameters. For instance, a sample average is an estimate of the mean.
to estimate the parameter values of a known distribution like normal distribution in this we estimate the parameters pop.mean and s.d