Sample
Definition of Sample
- A sample is a part of the population.
When a survey is being carried out, a sample is taken from the population one wants to study.
Examples of Sample
- Conclusions are made about the quality of goods being manufactured in a factory, after inspectors carefully examine a sample of the goods to decide whether the quality is satisfactory.
Solved Example on Sample
3,000 children in a city with a population of 10,000 children watch television for at least 3 hours a day.
How many children in a sample of 100 would watch television for at least 3 hours a day?
Choices:
A. 10
B. 3
C. 30
D.20
Correct Answer: C
Solution:
Step 1: Let x be the number of children in the sample who watch television for at least 3 hours a day.
Step 2: 
Step 3: 
[Write the proportion.]
Step 4: x ´10000 = 3000 ´ 100 [Cross multiply.]
Step 5: 
[Divide both sides by 10000.]
Step 6: 
[Simplify.]
Step 7: So, about 30 children in every 100 would watch television for at least 3 hours a day.
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