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Quiz 12.1

Chapter 12 - Day 3

Students Struggled With…
  • Calculating expected counts incorrectly by not using the whole sample, but instead each category count times the proportions.

  • Properly wording hypotheses. Many students simply wrote, “The claimed distribution is true” without context. This is especially problematic when we are checking to see if a claimed distribution matches a different distribution (i.e. Michigan population vs. national population).

  • Encourage students to add all of their expected counts when they are done. It should add to the total sample. If it doesn’t, they’ve done something wrong.

  • Spend time in class just writing hypotheses for tests. This will be especially helpful after students have learned about Chi-Square tests for Homogeneity and Independence. Mix up the types of tests and have students practice writing hypotheses in context.

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