The mathematical purpose of the lesson is for students to recognize the purposes of and differences among sample surveys, experiments, and observational studies. The work of this lesson connects to previous work because students critiqued and evaluated reports on statistical studies from the popular media. The work of this lesson connects to upcoming work because students will investigate the meaning of random in a statistical sense and understand what it means to select at random. When students take turns with a partner listening to their partner’s thinking about and explain their own thinking about recognizing the purposes of and differences among sample surveys, experiments, and observational studies, students are explaining their reasoning and critiquing the reasoning of others (MP3).
- Describe (orally and in writing) the purposes of and differences among sample surveys, experiments, and observational studies.
- Let’s examine different kinds of studies.
- I can describe the different purposes for each type of study design (survey, observational study, or experimental study).
- I can recognize the difference between a survey, observational study, or experimental study.
- I understand that my choice of the design for a study will impact what questions I can answer.
An experimental study collects data by directly influencing something to determine how another thing is changed.
An observational study collects data without influencing the subjects directly.
A survey is a set of questions given to people to seek their responses.
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