A university wants to know the average yearly salary of its alumni ten years after graduation. It has a list of all alumni who graduated ten years ago and writes to each one, asking for information about annual salary. Suppose that $40 \%$ of the alumni respond to this invitation.
-Describe what it means for age to be a confounding variable in this context. Be sure to indicate how this potential confounding variable could be related both to the explanatory and the response variables.

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The Answer of A university wants to know the average yearly salary of its alumni ten years after graduation. It has a list of all alumni who graduated ten years ago and writes to each one, asking for information about annual salary. Suppose that $40 \%$ of the alumni respond to this invitation.
-Describe what it means for age to be a confounding variable in this context. Be sure to indicate how this potential confounding variable could be related both to the explanatory and the response variables.

A University Wants to Know the Average Yearly Salary of Its