An Associated Press article captured the attention of readers with the headline “Night lights bad for kids?” The article was based on a 1999 study at the University of Pennsylvania and Children’s Hospital of Philadelphia, in which parents were surveyed about the lighting conditions under which their children slept between birth and age 2 (lamp, night-light, or no light) and whether or not their children developed nearsightedness (myopia). The purpose of the study was to explore the effect of a young child’s nighttime exposure to light on later nearsightedness.
To answer the questions below, we provide you with both SAS and SPSS output, but we encourage you to try and generate this output yourself in your chosen statistical software.
In SPSS
In SAS
Data: nightlight.xls or nightlight.csv
Question