Lecture_4(N) - PSYC 1010 LECTURE 4 NOTES October 8 2010...

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PSYC 1010 LECTURE 4 NOTES – October 8, 2010. Descriptive Stats: Measures of Central Tendency Variability: How much scores are spread out from the mean A) Range – subtract the lowest from the highest score (90 – 40 = 50) [Might give you representative data – not the best method] B) Standard Deviation – Measures the average spread of scores from the mean (deviation). It takes ALL scores into account and not just the highest and lowest ones. [Formula in appendix B – will not be asked] THE HIGHER SD, THE HIGHER VARIABILITY IN THE SET OF SCORES (Higher scores in set = more variation // Lower scores = lower variation) [Test: Given two set of scores, give which set has a higher SD.] Normal Distribution: Hypothetical (What it would look like if you tested whole population) Important because most psychological variable are usually distributed (Traits, Scores) Provides a precise way of determining how people compare to one another on a given variable Mean = Mode = Median Symmetrical (if you cut it half each half is the mirror image of other (graph)) RAW SCORE (Can be mathematically converted into…) STANDARD SCORE (Tells exactly where you fall so you compare with other people tested; mathematically converted into…)
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PERCENTILE SCORE (Indicates percentage of people who score at or below your score EX: 73 rd
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