PSYC1002 Lecture Notes - Lecture 20: Intelligence Quotient, Standard Deviation, Fluid And Crystallized Intelligence

• School: University of Sydney
• Department: Psychology
• Course: PSYC1002
• Professor: Caleb

Document Summary

Calculate metal age, ratio iq and deviation iq. Iq (intelligence quotient) was introduced in the stanford-binet test: mental age. It was the original measure used in stanford-binet (but has now been replaced with deviation iq: = (cid:3041) (cid:3042)(cid:3041)(cid:3042) (cid:883)(cid:882)(cid:882: allows comparison of intellectual performance across age levels, e. g. Mental age = 7; chronological age = 7; iq = 100: e. g. Mental age = 2; chronological age = 4; iq = 50: mental age = 12; chronological age = 10; iq = 120, ratio iq only works if mental age increases proportionally with chronological age. 50-year-old has a mental age of 25: deviation iq. Iq scores means the same thing, regardless of the comparison group. Iq of 70 means you are 2 standard deviations below average. Iq of 115 means you are 1 standard deviation above the average: gives the appearance of stability in iq. Stanford-binet (4th edition) had 15 subsets in four areas of cognitive ability.