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Be creative.

  • Generate your own valid, specific, plausible alternate explanation.
  • Identify

whether it is suggesting a preexisting difference between the groups, suggesting a difference in treatment, or questioning the validity of the outcome variable.

If you are suggesting a preexisting difference between the groups or a difference in treatment, be sure to state how the three variables are related. In this case, the claim is between using Verbal Advantage and income. You can propose that there is another variable but you must explain why it is linked to both using Verbal Advantage and income (i.e., you can't propose that one group would eat more broccoli than the other group unless you can connect why broccoli would be more available to one group than the other and why eating more broccoli would lead to higher income.)

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