GGR270H1 Lecture : ggr270 lecture oct 12
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8 1/2 by 11 paper sheet cheat sheet (double sided) No mathematical questions on the multiple choice part. Ex. number of variables, define what scale of measurement they were measured at. Ex. difference between a median and a mean. Ex. if the result shows a skewed result - do we use a median or the mean? (skewness formula) What does covariance give you and why is it important - it gives you the direction (+ or -) Variance is the sum of squared differences around the mean. Covariance - we are not squaring because we want the direction. Probability focuses on the occurrence of an event where one of several possible outcomes could result outcome are (and must be) mutually exclusive can be thought of as frequency of an event occurring relative to all other outcomes. Example examine the record of wet and dry days over a 100 year period.