PSY 3392 Lecture 6: Chapter 5

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5 Oct 2017
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Representative sample allows results to be (interview) or in writing (questionnaire) generalized to the population. Used to obtain data about feelings, attitudes, preferences, symptoms, etc. of a specific population. Most common method of data collection in psychology. Goal assess relationship among naturally occurring variables to describe and/or predict. Population: set of all cases of interest. Sampling frame: specific list or subset of population (operational definition of population) (representative) sample: subset of population drawn from sampling frame. One or more samples are drawn from the a series of cross-sectional surveys are conducted over time population at one time to describe characteristics or examine differences. Same set of questions should be asked for each sample. Different samples should be drawn from the same population among populations (descriptive/ predictive) Cohort effects (shared temporal/life experiences like 9/11) Sees patterns of change but not cause of changes. Noncomparable successive samples: when successive samples are not representative of the same population.

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