PSYC401 Lecture Notes - Lecture 12: Statistical Inference, Squared Deviations From The Mean, Confounding
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Population: a complete set of individuals, objects, or scores that an investigator is interested in studying. Sample: a sample is a subset of the population. Parameter: a number calculated on population data that quantifies a characteristic of the population. Statistic: is a number calculated from a sample. Types of statistics: descriptive statistics: used to describe the sample of data collected. Inferential statistics: used to make inferences about the population from which the sample came. Independent variables: variables that we intend to manipulate: dependent variables: variables that are measured based on the manipulation. Central tendency: mean, most representative value at most of the time. b. It"s sensitive to extreme scores: sum of the deviations around the mean will always equal zero (x-), the sum of the squared deviations around the mean is always a minimum (ss) sum of the squares f.
