ACC 100 Lecture Notes - Lecture 4: Quartile
12 Dec 2015
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Document Summary
In this lesson, you will learn the measures of central tendency (mean, median, mode) and variability (range, inter quartile range, variance, standard deviation) and to graph a box-whisker plot. We can characterize any data set by measuring its central tendency, variation, and shape. Central tendency values give us a middle or average point of the data. Variability measures the spread or dispersion of the data. We denote sample mean by x , population mean by , sample size by n , and population size by n . Mean is the average value of the data. Sample mean x is calculated by the formula do affect the mean. x n. Here, we have to use the weighted average because different stores sold different number of printers. Suppose we have the data in a form of a frequency distribution, relative frequency distribution, or percentage distribution, then we use the weighted average method to find the mean.
