psych 9 13 07 - below you o Problem with percentiles...

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TA for noon Psych ~Nic ~T/Th ~11:00-noon ~Psychology Bldg, room 203Q STATISTICS ~ We have statistics to help us organize and make sense of the data ~ Measures of Central Tendency - Mean (average - Median (mid-score in ranking) - Mode (most common score) ~ MEAN - 1 - 2 - 2 - 2 - 0 - 3 - 1 - Total: 11/7= 1.57 = M ~ MEDIAN - 3 - 2 - 2 - 2 - 1 - 1 - 0 ~ MEASURING VARIATION - Range o Highest Score – Lowest Score = Range - Standard Deviation o How much on average the typical score deviated from the “mean” of the data set o The bigger the standard deviation, the more variation there is ~ REPORTING SCORES - Percentages o Number of items correct divided by the number of possible points - Percentiles o Percentiles tell you the percentage of people who took the test scored
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Unformatted text preview: below you o Problem with percentiles Let’s say 100 people took a 100 item test, Sue – 90/100 – 99%ile Bill – 88/100 – 98%ile Joe – 42/100 – 97%ile Percentiles don’t tell you how well you did ~ SCALES OF MEASUREMENT-There will be questions on test!!! READ! ~ CORRELATIONS-Correlational Coefficient r o Values range from zero to 1-Valence signs: +/--.80 versus -.82 ~ STATISTICS-Is the work of Satan-Ex. 4 out of 5 dentists recommend…-1 in 5 Americans are “functionally” illiterate…-Ex. Cannibalism… o 1992: Jeffrey Dahlmer of Wisconsin o...
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This note was uploaded on 04/17/2008 for the course PSY 2012 taught by Professor Negy during the Fall '07 term at University of Central Florida.

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psych 9 13 07 - below you o Problem with percentiles...

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