PSYC 315 Study Guide - Midterm Guide: Unimodality, Null Hypothesis, Frequency Distribution
22 Apr 2017
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Document Summary
Descriptive statistics: organize, summarize and communicate numerical information into a single number or a few numbers. Inferential statistics: use samples to draw conclusions about a population. Population: is a collection of all possible members of a defined group. Sample: is a set of observations drawn from a subset of the population of interest. Variables: observations that can take on a range of values. Type of variables: discrete: variables that can only take on specific values (e. g. , whole numbers, letters in name) Classification: nominal (discrete): category or name (gender, ordinal (discrete): ranking of data (1st, 2nd, 3rd, ratio (continuous): used with number that are equally spaced but has absolute zero. Interval (both): used with numbers that are equally spaced (temperature) (g(cid:396)ade, can"t have a negative g(cid:396)ade) Validity: measures what it is intended to measure. (e. g. , measuring tape should accurately measure height) The process of drawing conclusions about whether a relation between variables is supported or not supported by the evidence.
