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### 7 Cards in this Set

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 Center (symbols) 1.^x(this is x bar): this is sample mean 2.M: Sample Median Location (symbols) Q1, Q2, Q3 : Sample Quartiles Q2=M Mathematical Notation (sigma): sum of numbers x1: first in a set of values xi: i'th value n: number of values in a set Imp point Mean is the pont where the graph will balance if triangle out underneath it on x axis. Median 1. Order data 2.If n is even take av. of two middle no. 3. If n is odd take the middle value Note: are to the left of median is approx = are to left due to same no of observations on each side Applet Mean v Median conclusion The farther the outlier was from the median on the right the farther was the mean fromt he median. Mean v Median Skewed Distributions: Median is best as mean is affected by outliers Symmetric Distr: Both but mean mostly due to mathematical properties.