A human-factors psychologist suspects that Keyboard A is designed better and will therefore facilitate a higher words-per-minute rate than Keyboard B or Keyboard C. He tests 10 participants and measures their typing speed using all three keyboards. He counterbalances the order in which participants use the keyboards. Which of the following is the best representation of his research hypothesis?
a. Is Keyboard A designed better than Keyboard B or Keyboard C?
b. Keyboard design does not affect typing speed.
c. Does keyboard design affect typing speed?
d. Keyboard design affects typing speed.
Ans: D
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