A teacher asks students to list the math lessons they learned on nine random school days in the past month. She evaluates the students’ performance on this assignment to get a general picture of how well students are taking notes. This teacher’s method is an example of

The teacher selects nine school days at random from the month, giving days an equal chance of being chosen. That is simple random sampling. Systematic sampling would use a regular interval, convenience sampling would choose days that are easiest to recall or access, and stratified sampling would select from distinct groups.

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