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Political Science 3N06 Semester II 2014 Lecture 4a overhead.doc

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Political Science
Todd Alway

Political Science 3N06 Semester II 2014 Lecture 4a: Probability and the Normal Curve - The normal curve is a theoretical distribution that happens to closely match many (although not all) real distributions o (Both physical and social variables) - Because of this, we can use the properties of the theoretical normal curve to help describe real data - In a normal curve, the mode, mean, and median are all located in the centre of the distribution - The curve is symmetrical around the centre, with 50% of the area under the curve falling on either side - A known proportion of the distribution falls between the mean and a given number of standard deviations away from the mean o E.g. 68.26% of the area under the curve falls between +- 1 standard deviation of the mean  i.e. in a normally distributed variable, 68.26% of the cases will have a score within +- 1 standard deviation of the mean - We can calculate the area between any two points in the d
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