(a)
To Explain: How can we know the "exact true effect size" even after an experiment. Yuan and Maxwell (2005) examined how the power of a study influences decision making as part of an experiment. Despite the experimental results, they stated in their introduction that it is generally not possible to determine the true effect size. When there is a large
(b)
To Explain: How does increasing the sample size improve our estimation of effect size when estimated Cohen's is used. Whether the new teaching strategy improve grades compared with the mean grade in the entire class (the population) if the mean grade in the entire class is
Estimating effect size. Yuan and Maxwell (2005) examined how the power of a study influences decision making as part of an experiment. Despite the experimental results, they stated in their introduction that it is generally not possible to determine the true effect size. When there is a large sample size, one can estimate the effect size. This estimate is close to the true effect size.".
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Essential Statistics for the Behavioral Sciences
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