Statistics has been defined by different authors differently due to changing scope of it in different times. Some of them are:

According to Webster, “classified facts representing the conditions of the people in a state …. especially those facts which can be stated in numbers or in any other tabular or classified arrangement”.

According to A. M. Tuttle, “Statistics are measurments, enumerations or estimates of natural or social phenomena, usually systematically arranged, analysied and presented as to exhibit important inter-relationship among them.”