‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ is a sample selected from a population in such a way that every member of the population has an equal chance of being selected & the selection of any individual does not influence the selection of any other.

• A. stratifies sample
• B. non‐random sample
• C. Simple random sample
• D. complex random sample.