A researcher reports that the mean time it takes to complete an experimental task is 1.4 ± 8.0 (M ± SD) seconds. If the null hypothesis was that the mean equals 1.0, then what is the effect size for this test using estimated Cohen's d?
a. d = 0.05; small effect size
b. d = 0.50; medium effect size
c. d = 1.05; large effect size
d. There is not enough information to answer this question.
Answer: A
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