Random Sample
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Definition of Random Sample
Random sample is a sample in which every individual or element in the population has an equal chance of being selected.
Random sample is a representative of the entire population.
Examples of Random Sample
 The following are examples of random samples.
 An environmentalist took 9 samples of effluents of an industry at different points.
 A teacher chose a boy and a girl from a group of equally talented boys and girls to lead a parade.
Video Examples: Random Sample
Solved Example on Random Sample
Ques: Chris has 4 boxes of red, green, and blue marbles. He mixed all the marbles and picked 16 marbles randomly without looking. Would he get a random sample of marbles?
Choices:
A. NoB. Yes
Correct answer: B
Solution:

Step 1: Chris picked 16 marbles randomly from the box without looking, so he doesn't know which color marble he picked up.
Step 2: All the three colored marbles have equal chance of being selected.
Step 3: So, the event of picking up the 16 marbles is a random sample.
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