You can improve statistical power through following ways:
Manipulate your independent variable firmly than before it will ascend the size of effect.
Try to increase sample size.
The increasement in significance level (alpha level) also helps to increase the statistical power.
There has to be reduction in measurement errors which you can perform by increasing the accuracy of the devices and procedures you are doing measurements on.
For t test and z tests you must utilize one-tailed test avoid using two-tailed test.
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