Category: Math and Statistics

The topics dispersion and variability (or variance) describes the “spread” of data in a distribution. This article explains how to compute the variance and the standard. The first measure of dispersion to look at is the variance. Let’s look at the data set below: X Values 4 5 2 7   Steps to Calculate Variance:…

The measures of central tendency are processes for determining what the central value in a dataset is. The most common is the arithmetic average, or mean – so this value has come to be known as simply the average. The three measures of central tendency are mean, median and mode. Mean To calculate the mean…

Frequency distributions are a simple way of organizing data based on how many each item has occurred. This can be used for individual values or for age ranges. The steps for making a frequency distribution are pretty simple. Let’s take a set of 20 students and their ages: 18 17 17 18 15 15 17…