Sampling where the interviewer talks to the most accessible section of the population, ie, shoppers willing to stop and be interviewed. This is not random sampling. This is also known as Accidental ...

Investopedia contributors come from a range of backgrounds, and over 25 years there have been thousands of expert writers and editors who have contributed. Representative sampling and random sampling ...

Adam Hayes, Ph.D., CFA, is a financial writer with 15+ years Wall Street experience as a derivatives trader. Besides his extensive derivative trading expertise, Adam is an expert in economics and ...