Effects of A Nonrandom Sample

Make Connections

Performance Task

Ways of Thinking: Make Connections

Take notes about the different approaches your classmates used to describe and make conclusions about the data.

As your classmates present, ask questions such as:

  • Which value is a better indicator of the typical score—the mean, median, or mode? Why?
  • Where is the data clustered on the line plot? What is the range of the data?
  • What does this information tell you about the data, and possibly the sample?
  • What is a typical score for Class A? For Class B?
  • Based on the line plots, which class performed better on the test? How do you know?
  • Are either of these samples a random sample? Explain.
  • Would you consider the combined results of the two samples to be a random sample?
  • Are the combined class results closer than the separate class results to showing how all the seventh graders in the district did on the test? Explain.