A researcher reports a 95% CI –0.02, 0.04. If the null hypothesis were that the mean in the population equals 0, then what is the effect size for this confidence interval?

A. effect size = 0.01
B. effect size is between 0 and 0.04 points
C. effect size is between –0.02 and 0.04 points
D. no effect size can be reported for this CI


Ans: D

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