STAT 213 Lecture Notes - Lecture 3: Roger Maris, Metic, Quartile

• School: University of Calgary
• Department: Statistics
• Course: STAT 213
• Professor: Anatoliy Swishchuk

Document Summary

1 description of a distribution with num- bers. A numerical summary of a distribution should report its center and its spread or variability, and brief description should include its shape (de- scribing by histograms and stemplots) The mean x describes the arithmetic average of the observations. To nd the mean of a set of observations, add their values and divide by the number of observations. If the n observations are x1, x2, , xn, their mean is or, in more compact notation, X = x1 + x2 + + xn n. 2. 1 examples: the babe"s mean number of home runs hit in a year is: 15 (54 + 59 + + 22) = 43. 9: roger maris"s mean, from the data of lecture 1, is: Ruth"s superiority is evident from these averages: 43. 9 > 26. 1. If numerical description can resist the in uence of extreme observations, we say that it is a resistant measure.