# 3. Develop a method for acquiring a random sample (A)

teaches Common Core State Standards CCSS.Math.Content.7.SP.A.1 http://corestandards.org/Math/Content/7/SP/A/1
teaches Common Core State Standards CCSS.Math.Practice.MP3 http://corestandards.org/Math/Practice/MP3

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Lesson objective: Develop a method for acquiring a random sample.

Students bring prior knowledge of summarizing numerical data sets in relation to their context, such as by: Describing the nature of the attribute under investigation, including how it is measured and its units of measure from 6.SP.5b. This prior knowledge is extended to analyzing how data is acquired as students develop methods of random sampling. A conceptual challenge students may encounter is choosing a biased sample and saying it is random.

The concept is developed through work with making and defending claims about which sample is most random.

This work helps students deepen their understanding of equivalence because maintaining an equal chance of selection and unbiased data helps provide a more random sample of the population.

Students engage in Mathematical Practice 3 (Construct viable arguments and critique the reasoning of others) as they analyze and critique various methods of sampling and their degree of randomness.

Key vocabulary:

• Random
• Sample
• Representative
• Bias

Special materials needed:

• None
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