PSYC 3000 Lecture Notes - Lecture 5: Descriptive Statistics, Standard Deviation, Internal Validity
20 Aug 2016
School
Department
Course
Professor
Document Summary
It is the underlying variable that we are measuring, not the numbers themselves, that is important in defining the scale: true, false. 1. 16 we trained rats to run a straight-alley maze by providing positive reinforcement with food. On trial 12, a rat lay down and went to sleep halfway through the maze. The implication is that speed is a poor measure of learning unless we assume that the animal suddenly went to sleep and had forgotten all he knew of the task. Speed is probably a much better index of motivation than learning. *** read interval and ratio scale in textbook*** We have a phone book, big population but there are limitations. Underrepresented: youth, lower socioeconomic status overrepresented: elders, higher ses. 1. 22 the chicago tribune of july 21, 1995, reported on a study by a fourth-grade student named beth peres.
