Chi-Square Test for Association

Day 144 - Lesson 10.4

Learning Targets
  • Check conditions for a test about the relationship between two categorical variables.

  • Calculate the P-value for a test about the relationship between two categorical variables.

  • Use the four-step process to perform a chi-square test for association.

Activity: Do you prefer math or English?
Activity:
Answer Key:
Activity Link Pic.JPG

Again, this is a context we explored earlier in the year.  It’s fun when the students recognize that.  I like to tell them they can change their vote now that math is obviously their favorite subject after a year with me.

Today we are going to complete a full four-step chi-square test for association.  Yesterday we learned about the hypotheses for this test and how to calculate the expected counts.  Students only need the observed counts filled in and then they can work through most of the rest of the activity.  You will need to tell them how to find the degrees of freedom, df = (# of columns – 1) (# of rows – 1).

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