IMathAS-libretexts

A publishing company wanted to test whether typing speed differs when using word processor A or word processor B. The typing speeds (in words per minute) are recorded for a random sample of 25 typists using word processor A, and for another (different) random sample of 25 typists using word processor B. The appropriate set of hypotheses in this case is:

(H_o: μ_d = 0) and (H_a: μ_d < 0)
(H_o: μ_d = 0) and (H_a: μ_d > 0)
(H_o: μ_d = 0) and (H_a: μ_d ≠ 0)
None of the above. This is not a matched pairs situation.

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