Basic Statistical Symbols, Lecture notes of Statistics

Download Basic Statistical Symbols and more Lecture notes Statistics in PDF only on Docsity! Basic Statistical Symbols [*]  A distribution, also called the distribution for the independent variable  A distribution that is that the not same as X, also called the dependent variable  Sum all the elements [numbers] in the distribution  2 Square all the elements [numbers] then add them to each other () 2 Add all the elements then square the summation N The number of elements in a population distribution n The number of elements in a sample distribution X1 The first element [number] in a distribution X2 The second element [number] in a distribution Xn The last element in a distribution … All the elements between two points in a distribution Y Multiply X1 by Y1, X2 by Y2, …, Xn by Ynand sum the distribution  Greek letter for alpha: the intercept or a type I error  Greek letter for beta: the slope or a type II error  Greek letter for sigma, meaning the standard deviation for the population s Letter s, meaning the standard deviation for the sample s 2 Letter s square, meaing the variance for the sample s1 In a time series, the first data point; subscripts note the location of the data point sn – 1 In a time series, the second to the last data point. sn In a time series, the last data point.  Greek letter mu, meaning the [arithmetic] mean of the population Also call "X-bar" meaning the [arithmetic] mean of the sample Md Median Mo Mode Gm Geometric mean Hm Harmonic mean [*] Population vs Sample The population includes all objects of interest whereas the sample is only a portion of the population. Parameters are associated with populations and statistics with samples. Parameters are usually denoted using Greek letters while statistics are usually denoted using Roman letters.