We have covered major measures of center and location—mean, median, and mode—we now turn to other important measures: percentiles…

The basic principle of how stock prices move is based on market demand and supply. When there are more…

Variance represents the average of the squared deviations from the mean. Because we square the deviations, the variance is…

Creating good graphics is a very important part of data visualization. Data visualization is not a science this is…

Imagine you’re a teacher assessing student performance in a math exam where scores range from 0 to 100. You’ve…

Describing Numerical Data In the previous articles we described two kinds of variable numerical and categorical, also known as…