Question

in which sampling error is first estimated and then size of the sample is decided accordingly?​

Answer 1

Answer:

In statistics, sampling errors are incurred when the statistical characteristics of the population are estimated from a subset, or sample, of that population. Since the sample does not include all members of the population, statistics on the sample, such as means and quartiles, generally differ from the characteristics of the entire population, which are known as parameters. For example, if one measures the height of a thousand individuals from a immigration of one million, the average height of the thousand is typically not the same as the average height of all one million people in the country. Since sampling is typically done to determine the characteristics of a whole population, the difference between the sample and population values is considered an error.[1] Exact measurement of sampling error is generally not feasible since the true population values are unknown