st095 ยป

Summary of Lesson 2


This lesson deals with the ways of representing raw data in different forms so as make it easier for us to visualize and draw conclusions from it.

The most basic form of representation of data is tabular form, and this form works well for small datasets, but as the size of the dataset grows bigger other more compact forms are required.

Histograms
A Histogram is a graphical display of data using bars of different heights. This form gives us a good picture of the frequency of data points within chosen intervals.

Bar charts
This form is in many ways very similar to a histogram, the only difference being that in the later the variable in the x-axis is numerical (or quantitative) and the former it is categorical (or qualitative)

Normal Distribution
is one of the most common (and perhaps important) type of distributions in statistics. It can be characterized by a peak which with the figure being symmetrical about the highest point.