Collection of Data and Sampling Methods
Statistical data are the basic ‘ingredients’ of Statistics on which statistician work. A set of numbers representing records of observations is termed statistical data. The need to collect data arises in every sphere of human activity. However that ‘Garbage in garbage out’ applies in Statistics too. Hence adequate care must be taken in the collection of data. It is a poor practice to depend on whatever data available.
There are five important questions to ask in the process of collecting data: What?
This unit addresses the above Questions in detail