Because it is easily influenced by extreme values (i.e. it is not unbiased).
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what is the use and application of ratio estimator?
I think, the estimate is a numerical value, wile the estimator is a function or operator, which can be generate more estimates according to some factors. For example (xbar) is estimator for (meu), which can be various when the sample size in various, the value that will be produced is an (estimate), but (xbar) is estimator.
An outlier pulls the median towards it. For example 1,2,3 Median=2 1,2,3,7 Median=2.5
it doesnt have a median.
There's is always going to be a median. Never is there not going to be a median.