Comparing Two Data Sets: 8th Grade Performance Task
A project-based performance task in which 8th graders act as data researchers, collecting at least 10 real-world data points on two related groups (such as two NBA players' scores), organizing them in a table, and building dot plot and box plot displays to compare the sets. It builds data collection, statistical representation, and interpretation skills, and is designed as a multi-part alternative to a traditional test, with input fields guiding students through defining their research question and gathering data.
Teacher Guide & Tips
- Use this as an alternative assessment for a unit on data displays and measures of center and spread, with the collection phase taking roughly one class period and the full project spanning several days.
- Discussion question: Why might two groups look different in a dot plot but have similar medians, and what does the box plot reveal that the dot plot does not?
- Scaffold for struggling readers: Provide a pre-made table template with labeled columns and a worked example of plotting five values on a number line before students begin their own data.
- Extension for advanced students: Have them calculate the mean, median, IQR, and range for both sets and write a short argument about which group is more consistent, supported by their displays.
- Estimated time: About 3 to 5 class periods, depending on how much time students spend on data collection and graphing.
Comparing Two Data Sets: 8th Grade Performance Task
A project-based performance task in which 8th graders act as data researchers, collecting at least 10 real-world data points on two related groups (such as two NBA players' scores), organizing them in a table, and building dot plot and box plot displays to compare the sets. It builds data collection, statistical representation, and interpretation skills, and is designed as a multi-part alternative to a traditional test, with input fields guiding students through defining their research question and gathering data.
Teacher Guide & Tips
- Use this as an alternative assessment for a unit on data displays and measures of center and spread, with the collection phase taking roughly one class period and the full project spanning several days.
- Discussion question: Why might two groups look different in a dot plot but have similar medians, and what does the box plot reveal that the dot plot does not?
- Scaffold for struggling readers: Provide a pre-made table template with labeled columns and a worked example of plotting five values on a number line before students begin their own data.
- Extension for advanced students: Have them calculate the mean, median, IQR, and range for both sets and write a short argument about which group is more consistent, supported by their displays.
- Estimated time: About 3 to 5 class periods, depending on how much time students spend on data collection and graphing.