Week 3: Collection of data, Classification of data,Observation and Variable

Collection of Statistical Data:

Statistical Data
A sequence of observations, made on a set of objects included in the sample drawn from population, is known as statistical data.
 

  • Grouped data
  • Ungrouped data

Collection of Data
The first step in any enquiry (investigation) is the collection of data. The data may be collected for the whole population or for a sample only.It is mostly collected on a sample basis. Collecting data is very difficult job.

Types of Data
There are two types (sources) for the collection of data:

  • Primary Data
  • Secondary Data

Classification of Data:

The process of arranging data into homogenous groups or classes according to some common characteristics present in the data is called classification.
Bases of Classification:
There are four important bases of classification:

  •   Qualitative Base 
  •   Quantitative Base  
  •   Geographical Base
  •   Chronological or Temporal Base

Observation :

General Meaning of Observation in Statistics. An observation in statistics is a value of something of interest you’re measuring or counting during a study or experiment: a person’s height, a bank account value at a certain point in time, or number of animals.
 Variables:
 
A characteristics which varies by individual to individual or an object to object is called as variables. For example age varies person to person.

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