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Interpretation, difficulty 3 of 3

Explain the engagement bias

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The HR director of the (fictional) Palmstone Group wants to report the unweighted survey average as “employee engagement across the company”. Response rates were 45% in Operations and 80% in HR, and the low-response departments are less engaged. In two to four sentences, explain why the unweighted average is misleading, in which direction, and what can and cannot be done about it.