IMathAS-libretexts

A publishing company wanted to test whether typing speed differs when using word processor A or word processor B. A random sample of 25 typists was selected and the typing speeds (in words per minute) were recorded for each typist when using word processor A and then when using word processor B. (Which word processor is used first is determined for each secretary by a coin flip).

(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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