Practice question · Sort into groups
Sort each factor by whether it raises or lowers a study's statistical power.
Groups: Raises power · Lowers power
- A more lenient alpha (0.10 instead of 0.01)
- A smaller sample
- A larger true effect size
- Noisier, more variable data
- Tighter, less variable measurements
Hints
- Anything that makes a true signal easier to see against the noise raises power.
- Bigger effects, more data, less noise, and a looser alpha help; small samples and noisy data hurt.
Show the answer
Raises power: A larger true effect size, A more lenient alpha (0.10 instead of 0.01), Tighter, less variable measurements
Lowers power: A smaller sample, Noisier, more variable data
Why
Larger effects, a more lenient alpha, and tighter measurements raise power; smaller samples and noisier data lower it. Power is fundamentally about making a real signal stand out from random noise.
Practise Power and Effect Size
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