Another dot in the blogosphere?

Posts Tagged ‘sample


Video source

This video is as much about misconceptions surrounding screen time as it is about:

  • Reading beyond headlines
  • Understanding how newspapers are not journals
  • Distinguishing engagement and accuracy; statistical significance and effect size; correlation and causation

It also illustrated how large sample sizes can make tiny effects statistically significant even though they have no practical significance.

For example, the video cited a study in Nature Human Behaviour that had a sample size of 355,358 adolescents. The video (also this article in Vox) highlighted how the study found that “wearing eyeglasses and eating potatoes also had significant yet small negative effects on teens’ wellbeing”. And yet we do not vilify either.

Add to that the fact that researchers have to decide where cut-offs are that distinguish statistically significant effects from non-significant ones (e.g., P value 0.01 vs 0.05). The same researchers or the agencies they work for might also make cut-offs like recommended screen times of no more than one hour before age five, even if the evidence does not support strict limits for any age groups.

TLDR? Newspapers oversimplify complex phenomena by providing easy answers. Real learning is not in taking these answers at face value. It happens when you explore nuance and depth instead.


http://edublogawards.com/files/2012/11/finalistlifetime-1lds82x.png
http://edublogawards.com/2010awards/best-elearning-corporate-education-edublog-2010/

Click to see all the nominees!

QR code


Get a mobile QR code app to figure out what this means!

My tweets

Archives

Usage policy

%d bloggers like this: