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The length of two different worm species is being compared. A random sample of 33 worms from Species 1 had a mean length of 6.5

The length of two different worm species is being compared.

A random sample of 33 worms from Species 1 had a mean length of 6.5 mm with standard deviation of 0.2 mm. For Species 2 a sample of 45 worms had a mean length of 6.1 mm with standard deviation 0.3 mm.

What is the value for the degrees of freedom (using n₁+ n₂-2)?

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