i) The purpose of the sample is to draw inference about population.

ii) Proportion is always zero or equal to one.

iii) The quantity computed from population is called parameters.

iv) The quantity computed from sample is called statistic.

v) The quantity which does not vary from individual to individual is called constant.

vi) Sum of random errors equal to zero.

vii) A variable is called random when its value cannot be exactly determined. 

viii) A variable that takes numerical values is called quantitative variable.

ix) The procedure of inferring about the population characteristics using the sample is called statistical inference.

x) First hand collected data is called primary data.