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Question | Answer |
---|---|
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 |