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PSYC 2021 (63)
Lecture

Lecture #4.docx

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Department
Psychology
Course
PSYC 2021
Professor
Agnieszka Kopinska
Semester
Fall

Description
Lecture #4 Shapes of Distributions Characteristics: 1. The number if peaks it has  1 peak-unimodel, 2 peaks-bimodel, many peaks-multimodel, flat-uniform  Our grades are usually distributed unimodelly  If you see 2 peaks, other variables may be involved. 2. Was it symmetrical? Skewed?  Negatively skewed, skewed to the left  The shape of normal distribution is mesokurtic.  Leptokurtic distribution is long and narrow, while platykuric distribution is flat. X f cf c% 10 2 20 100% 9 5 18 90% 8 7 13 65% 7 3 6 30% 6 2 3 15% 5 0 1 5% 4 1 1 5% Proportion=P=f/N c%=cf/N Interpolation  In a table yo
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