PSYC 3000 Lecture Notes - Lecture 5: Descriptive Statistics, Standard Deviation, Internal Validity
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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.