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16 Cards in this Set

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 Population The whole - complete group Sample a sub set of the population statistics from samples are often used to make inferences about a population Parameter Numerical data that describes a Population Statistic numerical measure that describes a Sample measures of central tendency mean median mode average center location most frequent Levels of measurement 1 Nominal 2 Ordinal 3 Interval 4 ratio the listing is from least to most specific measurment mean average formula Sum of X divided by n symbols sample mean X bar - X with a line over it population mean symbol that looks like U median center mode most unimodal one mode Bi modal 2 modes multi modal 3 or more modes often used instead of mean if the data is very skewed. Measures of Dispersion Range Variance Standard deviation Range Interquartile Range maximum Value minus minimum value = range of data Q3-Q1 gives the range of the middle If a value is added to each X in a distribution or sample this measure will not change outlier data value that varies significantly from the other values - they effect the mean Variance shows the amt of dispersion from the mean/ average of dispersion for the sample or population Symbols Sample S2 supra script Population greek symbol for alpha also with supra script 2 Variance formula for a sample Sum of X - X-bar squared divided by n-1 this formula is weighted Variance formula for a Population sum of X - U squared divided by n symol for mean is a greek letter that looks like a U Standard deviation Square root of the variance for both populations and Samples the calculation gives us the value = to 1 standard deviation deviation from the mean in standard units