Differentiate between a population and a sample. Why is it important to increase generalizability of research findings?

Differentiate between a population and a sample.
Why is it important to increase generalizability of research findings?
Differentiate between random and non-random sampling.
Choose a different research article in psychology from a peer-reviewed, scholarly journal. Identify the sampling method the authors used. Evaluate their sampling method and consider how the findings may have differed if the author used a different sampling method.