# Descriptive Statistics

Mean Absolute Deviation – Calculation | Examples

The mean absolute deviation (mean deviation about the mean) is a measure of the degree of dispersion of data values. It involves measuring the absolute difference of the data values from the mean and...

Five Number Summary for Even & Odd Number of Data

The five number summary is a set of five quantities associated with a data set that allows us to obtain an overall understanding of the distribution of data values. It consists of the following...

Quartiles for Even and Odd Number of Data

The quartiles are three numbers that split our data into precisely four equal parts. They are the lower quartile (Q1), the median (Q2), and the upper quartile (Q3). The procedure to find the quartiles...

Deciles for Grouped & Ungrouped Data – Calculation | Examples

Deciles are positional averages that give us important information about the distribution of the data. The nine deciles denoted as D_1,D_2,ldots,D_9 divide the given data set into ten equal parts. For example, the third...

Data Array in Statistics (Explained with Examples)

The best way to examine a large set of numerical data is first to organize and present it in an appropriate tabular and graphical format. The table below presents the total number of overtime...

Boxplot (Statistics) – Definition & Examples

The boxplot is a very popular graphical device in applications of descriptive statistics, which integrates a number of measures of central tendency and variability. Indeed, with just a single glance at a boxplot, one...

Median of Even Numbers – Procedure & Examples

The median is a positional average that tells us the value of the middlemost observation among all of the given data values. Since the median lies exactly in the middle exactly 50% of observations...

The quartile deviation is a positional average that is used to measure the spread of data values. It can be calculated by subtracting the lower quartile from the upper quartile and dividing the result...