Consider the following hypothesis test: Ho : H 2 Ho Orf > 1: "H Assume that o is unknown. Then, Select one: O a. we reject Ho ift <-ta2 or t 2 tal2 O b. we reject Ho if z < -za O c. we reject Ho if z < -za2 or z > Za/2 O d. we reject Ho if t < -ta O e. we reject Ho if z > Za O f. we reject Ho if t > ta

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