INTRODUCTION
The word statistics which comes from a Latin word status meaning political state . The word statistics is defined as a disciplined that includes procedures and techniques used to collect, process and analyses numerical data to make inferences and reach to decisions in the face of uncertainty.
IMPORTANCE OF STATISTICS
- Statistics assist in summarizing the larger set of data in a form that is easily understandable.
- Statistics assists in the different stages of labrotary and field experiments as well as surveys.
- Statistics assists in drawing general conclusions and in making prediction of how much of a thing will happen under given conditions.
- Statistical technique being powerful tools for analysing numerical data are used in almost every branch of learning.
- A business man, an industrialist and research worker all employs statistical methods in their work
- Social scientist also uses statistical methods in various areas of socio economic life of a nation.
Collection of fact and figures in raw form is called data.
QUALITATIVE DATA
Those variables which cannot be expressed numerically for example beauty, satisfaction etc.
QUANTITATIVE DATA
Those variables which can be expressed numerically such as age, weight and population etc. for example 30 kg weight, this is numeric data.
DISCRETE VARIABLES
Variables that can take only discrete integers or whole number not decimal number. For example ( 1, 2 , 3 ,4). Number of students in the class.
CONTINOUS VARIABLES
Those variables that can take on any value fractional/decimal with in given interval. For example height of the students.
DISCRETE QUANTITATIVE DATA
Number of trees in a park
Number of students in the college.
DISCRETE QUALITATIVE DATA
Number of intelligent students in the class
Number of White cars in the car park.
CONTINOUS QUANTITATIVE DATA
Weight of the student
Length of trees in a park.
CONTINOUS QUALITATIVE DATA
Tallest tree in the jungle
Highest peak of the mountain.
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