A human-factors psychologist randomly assigns half of his participants to use Keyboard A and the other half to use Keyboard B. He measures the number of words per minute typed by people in each group. He suspects that Keyboard A is designed better and will therefore facilitate a higher words-per-minute rate. He conducts an independent-samples t-test and obtains the following results: What is Cohen’s d in this example?



a. 1.44

b. 1.95

c. .067

d. .872


Ans: D

Psychology

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