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Final

# Week 4 Study Notes

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University of Toronto St. George

Geography

GGR270H1

Damian Dupuy

Fall

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GGR 270 Lecture 4 October 6, 2010 Normal Distribution Z Scores Standard scores are referred to as Z Scores Indicate how many Standard Deviations separate a particular value from the mean Z Scores can be positive or negative depending if they are > or < the mean Z score of the mean is O and the Standard Deviation is positive or negative Table of normal values provides probability info on a standardized scale But, we can also calculate Z scores Formula involves comparing values to the mean value, and dividing by the Standard Deviation Expressed as: Result is interpreted as the number of standard deviations an observation lays above or below the mean. Skewness Measures the degree of symmetry in a frequency distribution Determines how evenly the values are distributed either side of the mean Expressed as: www.notesolution.com

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