## Is sample mean unbiased estimator?

The sample mean is a random variable that is an estimator of the population mean. The expected value of the sample mean is equal to the population mean µ. Therefore, the sample mean is an unbiased estimator of the population mean. A numerical estimate of the population mean can be calculated.

## Why is it important to have an unbiased sample?

When you’re trying to learn about a population, it can be helpful to look at an unbiased sample. An unbiased sample can be an accurate representation of the entire population and can help you draw conclusions about the population.

## What is importance of sample?

Sampling saves money by allowing researchers to gather the same answers from a sample that they would receive from the population. Non-random sampling is significantly cheaper than random sampling, because it lowers the cost associated with finding people and collecting data from them.

## Why do we use samples?

Using samples allows researchers to conduct their studies easily and in a timely fashion. In order to achieve an unbiased sample, the selection has to be random so everyone from the population has an equal and likely chance of being added to the sample group.

## What is the main goal of sampling?

The goals of sampling are to use a procedure that is likely to yield a “representative” sample of the population as a whole (i.e., to limit exposure to sampling error), while holding down sampling costs as much as possible.