Find the critical value

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Find the critical value. Assume that the test is? two-tailed and that n denotes the number of pairs of data.

 

n=?20,

α=0.01

 

 

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Part 1

 

 

A.

0.570

 

 

B.

−0.570

 

 

C.

±0.447

 

 

D.

±0.570