As a research-parent-nerd joke before Christmas, six doctors swallowed Lego heads and recorded how long it took to pass the Lego heads. Why? As to inform parents about the lack of danger associated with your kid swallowing a tiny toy.
I encourage you to use it as a class example because it is short, it describes its research methodology very clearly, used a within subject design, has a couple of means, standard deviations, and even a correlation.
Note the use of a within subject design. They also operationalized their DV via the SHAT (Stool Hardness and Transit) scale.
*Yeah. So here is the Bristol Stool Chart mentioned in the above excerpt. Please don't click on the link if your are eating or have a sensitive stomach.
Research outcomes, including mean and standard deviations:
An example of a non-significant correlation, with the SHAT score on the y-axis and the FART score on the x-axis.:
Here is a link to the original research. And here is a link to the blogger doctors who conducted this experiment.
1) Is this a sufficient sample size?
2) An example of human biology research that did sample equally from men and women.
3) In-class replication. I double dog dare you.
4) Non-significant correlation.