Learn By Doing – Causation

Published: December 25th, 2012

Category: Activity 1: Learn By Doing

 


 


http://phhp-faculty-cantrell.sites.medinfo.ufl.edu/files/2012/12/qzLBD_New_Causation1.swf

Hint


When we practiced exploring the relationship between two categorical variables, we looked at a study in which the type of light in young children’s rooms when they sleep was examined, along with their later nearsightedness, or myopia.

Here is the two-way table that summarizes the collected data:

The conditional percentages allow us to compare the distribution of later nearsightedness among children who were exposed to each of the three nighttime light levels:

The striking finding was that children who slept with lamps on were more than 5 times more likely to be nearsighted later in life (54.7% vs. 9.9%). Based upon this data alone, parents might discontinue using night-lights and lamps with young children.

http://phhp-faculty-cantrell.sites.medinfo.ufl.edu/files/2012/07/qz-LBD02022.swf

http://phhp-faculty-cantrell.sites.medinfo.ufl.edu/files/2013/01/qzLBD02023.swf

Reveal a visual representation for previous the question.


This document is linked from Causation.