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Professor Casey performs a t test of Ho: u1 - u2=0 using a-.01 and finds a significant difference between Xmean1 and Xmean2. From this we can infer.

a. a large difference between u1 and u2.
b. an important difference betwee u1 and u2.
c. u1 and u2 to be unequal.
d. all of the above.

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C. µ1 and µ2 to be unequal.

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