If a researcher performs a meta-analysis and finds that the mean d = 0.11, and t
ID: 3129198 • Letter: I
Question
If a researcher performs a meta-analysis and finds that the mean d = 0.11, and that the 95% confidence interval around this mean is (–0.04, 0.26), what could the researcher conclude?
The researcher can conclude that all future studies of this effect will find effect sizes somewhere between -0.04 and 0.26.
Because the confidence interval includes 0, there really is no effect, on average, in the literature.
There is a strong effect, but it is unclear what the direction of the effect is.
Averaging across all of the literature, there is a strong effect, and this effect is statistically significant.
The researcher can conclude that all future studies of this effect will find effect sizes somewhere between -0.04 and 0.26.
Because the confidence interval includes 0, there really is no effect, on average, in the literature.
There is a strong effect, but it is unclear what the direction of the effect is.
Averaging across all of the literature, there is a strong effect, and this effect is statistically significant.
Explanation / Answer
The researcher can conclude that all future studies of this effect will find effect sizes somewhere between -0.04 and 0.26.
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