Measures of Dispersion and Variation It is help to interpret the variability of data. To know how much homogenous or nonhomogeneous the data There are two main types of measures of dispersion in statistics which are :
a) Absolut measures of dispersion and variation
b) Relative measures of dispersion and variation
Measures of Central Tendency Usually used to describe the data congestion about a central value. The measures of central tendency include:
1. Mean
2. Median
3. Mode
After collecting data from any phenomenon, this data is not arranged or organized, so we need to present it in a way that makes it easy to study. Unclassified data: is the raw data collected about the phenomenon unless it is tabulated . Classified data: is data arranged and organized in a frequency distribution table (categories, frequencies).