for Math guy only

1. Having a representative sample is vital to making sound business decisions.

2.Sampling is the field of statistics that is involved in the collection, analysis, and understanding of data gathered from random samples of a population under study. Sampling theory is concerned not only with the proper selection of observations from the population that will constitute the random sample; it involves the use of probability concept, along with prior knowledge about the population parameters, to analyze the data from the random sample and develop conclusions from the investigation.