1. “Fallen angels will all go back up, eventually.” A “fallen angel” is a stock that once performed well…

To understand how spread out a set of data points can be, we need to measure the variation. The…

There is an important distinction between a sample of data and population of data. So, let’s take a research…

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

Choosing which statistical test to use, given the variables is often confusing for researchers and analyst. One of the…

In previous article we discussed about variance and standard deviation, assuming we had a population of data, even though…