PSYC 3250 Chapter Notes -Factor Analysis, Standard Deviation
10 Oct 2012
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Document Summary
Chapter 4: basic concepts in measurement and statistics. Measurement - the process of assigning numbers to objects in such a way that speci c properties of objects are faithfully represented by properties of numbers. Psychological measurement - the process of assigning numbers to persons in such a way that some attributes of the persons being measured are faithfully re ected by some properties of the numbers. The cornerstone of psychological measurement is the assumption that individuals differ. Psychological measurement specialists are interested in assigning individuals numbers that will re ect their differences. The assumption of stable individual differences means that people differ in discernible and potentially measurable ways in their behaviour and that those differences persist over a suf ciently long time to make their measurement useful. Psychological tests are designed to measure speci c attributes of persons, not the whole person. Psychological tests only tell us ways in which individuals are similar or different.
