Data is set of observation. This observation can be collected in various ways such as field notes, survey or…

Previous article discussed the basic contingency table of proportions and percentages. People often want to ask more about relationships…

One issue with range and the interquartile range (IQR) both is that they don’t include information from all the…

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

The Challenger disaster occurred on January 28, 1986, during the launch of the Space Shuttle Challenger. The Space Shuttle…

Mean is the one of the most commonly used measures of central tendency. It’s a powerful tool for understanding…