Question: Which teacher exhibited the most variable year to year performance over this 5 year span?

Answer: During the course of these five years, Ed’s performance varied the greatest from year to year.

Explanation: The majority of changeable performance refers to non-consistency or fluctuating performance.

As revealed in the graph,

Jill’s performance was continuous throughout 2005-07.

Ralph’s performance was continuous throughout 2006-07 and likewise in 2008-09.

Tina’s performance was constant through 2007-09

Sam’s performance was constant through 2008-09

All of them have been consistent at least once. However, the majority of changeable performance refers to non-consistency or fluctuating performance.

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