<p>I'm looking for examples of studies where the result is highly significant but the effect is so tiny that it is meaningless in a practical sense. These will be shared with undergraduate psychology students to illustrate that statistically significant doesn't always mean important or consequential.</p>

CC BY-SA 3.0
2015-11-11T19:00:23.700Z
There's the recent [Facebook emotion contagion study](http://www.pnas.org/content/111/24/8788.full.pd) (e.g., "P < 0.001, Cohen’s d = 0.02" and "P = 0.007, d = 0.001").
mrt
CC BY-SA 3.0
2015-11-12T09:05:23.950Z
Problem might get worse if you include CIs - as many CIs reported in studies with low p values include very low effect sizes.
jona
<statistics><teaching-of-psychology>
What are some examples of psychology studies with tiny effect sizes and tiny p-values that are good for teaching?
Josh
# What are some examples of psychology studies with tiny effect sizes and tiny p-values that are good for teaching?

(Asked by: username_0 on 2015-11-11)

I'm looking for examples of studies where the result is highly significant but the effect is so tiny that it is meaningless in a practical sense. These will be shared with undergraduate psychology students to illustrate that statistically significant doesn't always mean important or consequential.

**Tags:** statistics, teaching-of-psychology

> **Comments:**
> **username_1**: There's the recent [Facebook emotion contagion study](http://www.pnas.org/content/111/24/8788.full.pd) (e.g., "P < 0.001, Cohen’s d = 0.02" and "P = 0.007, d = 0.001").  
> **username_2**: Problem might get worse if you include CIs - as many CIs reported in studies with low p values include very low effect sizes.  

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## 0 answers

