This document provides an overview of basic statistical concepts. It defines key terms like population, sample, parameter, and statistic. It also describes different types of data like quantitative, qualitative, discrete, and continuous data. Additionally, it covers different levels of measurement like nominal, ordinal, interval and ratio scales. The document also discusses sampling methods such as random sampling and stratified sampling. Finally, it defines important concepts like sampling error, non-sampling error, reliability, and validity.