In data analysis, identifying outliers with the box plot  rule helps pinpoint data points that significantly deviate from the…

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

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

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…

There are two main kinds of studies, observational studies and, experimental studies. The statistical process can be viewed in…