PSYC 1002 Lecture Notes - Mental Age, Lewis Terman, Construct Validity

• School: Carleton University
• Department: Psychology
• Course: PSYC 1002
• Professor: Lorena Ruci

Document Summary

Major characteristics of bell curve: mean, median, and mode are the same. Properties: can never be negative, sensitive to outliers (extreme score that greatly influence standard of deviation, in some cases, it can be zero, i. e. when all the scores are the same. Same person, same score: test-retest reliability. Error: inability to have a measurement that is a perfect representation of the concept we"re trying to capture. In psychological testing, the score is a representation of the true score plus error (x. Error is important because, in our measurements, we are constantly trying to get the score (x) closer to the true score (t) Random error: unpredictable; if you could predict it, you could control it. Random error always contaminates the true measurement. Time sampling error: test-retest reliability: correlation of two scores, testing math ability to one group in the morning, one in the afternoon, and one at night, more people are fatigued late at night.