14. An Associated Press article captured the attention of readers with the headl

Question

14. 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 Pennsyvania 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. Among the children who were exposed to no light at all, what percent developed nearsightedness? No Yes Total 34 (45.33%) 153 41 (54.67%) 79 75 (100%) 232 lamp night light (65.95%) (34.05% 155 (90.12%) 17 172 (9.88%) (100%) no light a. 90.12 b. 28.60 c. 9.88 d. 45.33

Explanation / Answer

172 chidren exposed to no light at alll

in that row yes =17 so 17 developed nearsightedness

17=x%*172

x=17/172*100

=1700/172

=9.88%

OPTION C

9.88%

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