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intro stats

msu denver ribble stats

parameter vs statistic parameter = data for the population statistic = data for a sample paramater = 100% - descriptive, factual statistic = PART of the population, representative, helpful for inference. <population parameter PP> <sample statistic SS>
EMPIRICAL RULE data within +/- (1, 2, or 3) Standard Deviations from mean only applies to BELL shaped data distributions ... 68 % of data within 1 standard deviation { x | -1 < x < 1 } ... 95% of data within 2 standard deviations { x | -2 < x < 2 } ... 99.7% of data within 3 standard deviations { x | -3 < x < 3 } ...
CHEBYSHEV'S RULE used for NON-BELL shaped distributions... 1 - (1/k^2) ... where K equals the number of standard deviations from mean
Created by: danchopanda