Survey
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
Stats 95 • Mean • μ = population mean (“MU”) • • • • M or = sample mean ∑ = Sigma, summation (“add all of these”) N = population size Later… n = sample size X N Variance & Standard Deviation SD2 or σ2 = Variance X N SD or σ = Standard X N Deviation 2 2 2 Z-Scores: The Standard Deviation “Meter” X • Use Z-scores to express values regardless of the original unit of measure • E.g., feet or meters • Once you have the standard deviation, you can go from raw scores to z-scores, and from z-scores to raw scores. N z ( X ) X z 2 Normal Distributions