Which of the following strategies is the most appropriate to increase the statistical power of a study that compares the mean of the dependent variable of an experimental group and the mean of the dependent variable in a control group.

1. Decrease the significance level from 0.05 to 0.01.

2. Increase the significance level from 0.05 to 0.10.

3. Plan a very well designed study that expects very low variability within the groups in the dependent variable.

4. Choose a larger effect size than it is normally expected in this type of study.

5. Only conduct the research only if a very large sample size is feasible to be collected.