Used to summarize and evaluate research results in the behavioural sciences. Statistics: refers to a set of mathematical procedures for organizing, summarizing and interpreting information. Statistical procedures help ensure that the information or observations are presented and interpreted in an accurate and informative way. Provide researchers with a set of standardized techniques that are recognized and understood throughout the scientific community. Research in the behavioural sciences typically begins with a general question about a specific group of individuals. Population: the set of all the individuals of interest in a particular study. Populations can vary in size, must be identified by the researcher, and need not be of humans (can include animals) However, populations tend to be very large. Therefore, researchers typically select a smaller, more manageable group from the population known as a sample. Sample: set of individuals selected from a population, usually intended to represent the population in a research study.