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A researcher is investigating fitness levels using a new training program. The research collected a sample...

A researcher is investigating fitness levels using a new training program. The research collected a sample of 10 males and 10 females. The researcher is investigating differences between males and females. how many degrees of freedom would be needed for this test.

a. 18
b. 19
c. 2 and 18
d. none of the above

*please explain your conclusion to me!

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