Grade 7 Math: Random Sampling Worksheet
A Grade 7 math worksheet focusing on understanding and applying random sampling techniques to make inferences about a population.
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Random Sampling Review
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Read each question carefully and answer to the best of your ability. Show your work where applicable.
1. Which of the following is the best example of a random sample?
Asking only your friends about their favorite video game.
Selecting every 10th student from a school's alphabetical roster to survey.
Surveying students who volunteer to participate in a study.
Only asking students in the advanced math class about their study habits.
2. A is a part of the population that is chosen to represent the entire group.
3. Random sampling helps ensure that a sample is of the population.
4. A biased sample is one where every member of the population has an equal chance of being selected.
True
False
5. A school wants to know if students prefer pizza or hamburgers for lunch. Describe how they could use a random sampling method to get an unbiased opinion.
6. A bag contains 20 marbles: 8 red, 7 blue, and 5 green. If you randomly select one marble, what is the theoretical probability of selecting a red marble? Explain your answer.