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7 Cards in this Set
 Front
 Back
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. 