1. Examples each of samples:
- A representative group of few individuals taken form a particular locality to study the impact of rise in prices of petroleum products
- A group of students from the school is selected to study average monthly expenditure
2. Examples each of population:
- All individuals residing in a particular locality about .
- whom the information is to be collected All students in a school for whom the information is to be collected.
3. Examples of each of variables:
- Changing price of petrol
- Increase or decrease in the production of rice.
