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

Stem and leaf plot is used to plot for a numerical variable. It’s essentially a way to list our…

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

One of the way to measure the variability is to calculate the difference of each observation from the mean.…

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

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