Subject: Statistics and probability General Definitions Parameter: Any numerical Quantity which is calculated from the population data is called a parameter. A parameter has only a single fixed value therefore it is a constant Quantity. A descriptive measure of population is called a parameter. ************************************************************************** Name of branches of Statistics 1.       Descriptive statistics 2.       Inferential statistics ************************************************************************* Observation: Any recording of information is called observation. *********************************************************************** Data: Collection of information is called data. ********************************************************************** Primary data: Primary data are those which are collected for the first time and they are original in character and hav...