Effects of A Nonrandom Sample

Make Generalizations About a Population

Work Time

Make Generalizations About a Population

Use these test results for Class A to describe the seventh graders in the district (870 total).

Think of all the tools you can use to describe and analyze data—measures of center, measures of spread, line plots, box plots, and histograms—and how you might use these tools in this problem.

"X" represents one student in Class A.

Answer the following questions:

  • Which tools do you think will be most helpful to you?
  • What is the typical score on the district math test? How can you show this?
  • Where do the middle 50% of the scores lie?
  • About how many seventh grade students in the district would have the typical score?
  • About how many seventh grade students would have each of the scores?
  • What are some of the tools you can use to analyze data?
  • Have you tried using any of the graphing tools?
  • How many data points are on the line plot?
  • How does that number compare to the total number of seventh grade students in the district?
  • Does the sample represent the population of the district?