Grade 8 Random Sampling Worksheet
This worksheet helps students understand and apply concepts of random sampling, population, and sample bias.
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Random Sampling in Statistics
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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 students in a gifted program about their favorite subject.
Selecting every 10th student from an alphabetical list of all students.
Surveying only students who eat lunch in the cafeteria.
Asking friends about their preferred brand of sneakers.
2. What is the primary purpose of using random sampling in a study?
To make the study easier to conduct.
To ensure the sample accurately represents the population.
To get results that are always exactly the same as the population.
To only include people who agree with the study's hypothesis.
1. A convenience sample is a type of random sample.
True
False
2. The larger the random sample, the more likely it is to represent the population.
True
False
1. A is a subset of the population chosen to represent the entire group.
2. When every member of a population has an equal chance of being selected, it is called a sample.
3. The entire group of individuals or objects that a study is interested in is called the .
1. A school wants to know the average height of its 8th-grade students. There are 200 8th-grade students. Describe a method for selecting a simple random sample of 20 students.
2. Explain what 'sample bias' means and provide an example of how it can occur when trying to survey students about their favorite school lunch.
Read the following scenario and answer the questions.
A local ice cream shop wants to determine the most popular flavor among its customers. On a sunny Saturday afternoon, the owner stands outside the shop and asks the first 50 people who enter what their favorite flavor is.
1. Is this a random sample? Explain why or why not.
2. What potential bias might exist in this sampling method?
3. Suggest a better method for the ice cream shop owner to obtain a more random sample of customer preferences.