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So i'm about to take an exam and I can't figure out how to explain these three things; 1. The effect size of the study

So i'm about to take an exam and I can't figure out how to explain these three things;

1. The effect size of the study is increased by exaggerating levels of the IV?

2. A researcher increases the standard deviation in their sample (i.e., their sample has more variability)?

3. A researcher changes their hypothesis test from one-tailed to two-tailed?

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