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

Stock Traders look for various signal like GDP, inflation rate, interest rate to predict the future economic condition. One…

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

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

Bar Graph-two categorical variable In the previous article, we have discussed tabulating and graphing one categorical variable through table…

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