L33 Psych 300 Chapter 5: Sampling and Probability
7 Feb 2019
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Population - all possible observations about which we would like to know something. Typically not possible to measure an entire population. Sample: a set of observations drawn from a population of interest. We must estimate the mean and the standard deviation from the sample. Random samples - every member of the population has an equal chance of. Convenience sample - uses participants who are readily available being selected into the study. Generalizability - researcher"s ability to apply findings from one sample or in one context to other samples or contexts (external validity) Replication - we can increase external validity by duplicating scientific results, ideally in a different context or with a sample that has a different characteristic. Volunteer sample (self-selected sample) - a convenience sample in which. Random assignment - every participant has an equal chance of being assigned to any participants actively choose to participate in a study level of the independent variable.
