Shria tested the hypothesis that, on average, older rats from the cotton rat species have faster average maze completion rates than younger rats from the cotton rat species. On January 12, 2020, she documented the maze completion rates in seconds of a randomly selected sample of 33 younger cotton rats and of a randomly selected sample of 32 older cotton rats.  She concluded that, on average, older rats from the cotton rat species do not have faster average maze completion rates than younger rats from the cotton rat species. Refer to Exhibit 1.  What is the control variable?

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