Lecture 13 - Oct 14

Verbal skills in tact correlations between unrelated

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verbal skills in tact) - Correlations between “unrelated” IQ test items (ex. matrices, verbal) - in general people who do well in math do well in verbal even though we know people in general are good at one and not the other - Fluid Intelligence vs Crystallized Intelligence Mental Tests - Measures of mental abilities - achievement: What have you learned (crystallized)? what are your particular skills? - aptitude: what might we predict you could do, if you were given more training or time to learn it? what do you seem suited for? Insurance - actuarial tables - in part lead to measurement of intelligence - always been insurance of some kind (since any written history) - insurance used to be; if a group of people lived together and it was destroyed, the whole community would come help - if you didn’t help rebuild someone's house, yours wouldn’t be helped - modern insurance came into being due to boat story (guys boat broke in water and the town thought that it could happen to any one of them so they pooled money together for that situation) Individual differences - if you were to buy fire insurance; the insurance company will cover it in different ways; instead of 800 dollars a year you do only electrical fires which will cost 400; most people say yes - what if instead they said; we will insure you on all fires but only if it happens on even days of the month; no one will do this but it is the same statistics!!! The Study of Variation Oct. 14, 2010

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- begun as a way of summarizing patterns in such records as birth rates and death rates - individually, patterns difficult to discern - when plotted on a frequency graph, patterns emerge that we see in many types of unrelated data -most are “bell-shaped” - a pattern can be seen! - median and average are identical in a normal curve -median: separates top 50% with bottom 50% - mean: total of all scores divided by number of scores being summed - variability: the degree to which cases differ from each other -how many CD’s owned vs computers - CD’s vary from none to thousands! - computers have little variability... - this is reflected by shape of curve CORRELATION: -correlation expresses the relationship between 2 variables - covariance: the degree to which change in one variable is reliably associated with change in the second variable - Scatterplots show: - direction of relationship (-ve or +ve) - strength of that relationship - significant “outliers”
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• Winter '10
• Fountain,M
• Psychology, Intelligence quotient, intelligence vs, Fluid Intelligence vs Crystallized Intelligence, verbal intelligence vs, interpersonal intelligence vs

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