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Unformatted text preview: Statistics 528 - Lecture 4 Professor Kate Calder 4 The mode of a density curve is a peak point of the curve or a location where the curve is highest. The median of a density curve is the point that divides the area under the curve in half. The mean of a density curve is the point at which the curve would balance if made out of solid material. Statistics 528 - Lecture 4 3 Statistics 528 - Lecture 4 Professor Kate Calder 5 For a symmetric density curve, the median = mean. For a right-skewed density curve, the mean > median. For a left-skewed density curve, the mean < median. Statistics 528 - Lecture 4 Professor Kate Calder 6 We need to distinguish the mean and standard deviation of a density curve (characteristics of the mathematical model) from the mean and standard deviation of the data. Notation: Data distribution: mean = sample average ( ), standard deviation (s) Density curve: mean ( ), standard deviation ( ) x...
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This note was uploaded on 07/26/2011 for the course STA 528 taught by Professor Calder during the Winter '09 term at Ohio State.
- Winter '09