The following table and graph display the data from this study. | | Darkness | Night light | Room light | TOTALS | |---|---|---|---|---| | Far-sighted | 40 | 39 | 12 | 91 | | Normal refraction | 114 | 115 | 22 | 251 | | Near-sighted | 18 | 78 | 41 | 137 | | TOTALS | 172 | 232 | 75 | 479 | [Stacked Bar Chart showing percentages for Darkness, Night light, and Room light] e. What does the data suggest about the association between near-sightedness and higher levels of light exposure? Support your answer using conditional percentages. f. Is it valid to conclude that sleeping in a lit room or with a night light causes an increase in a child's risk of near-sightedness? Why or why not? g. Identify at least one confounding variable. Explain how this variable might be responsible for the association we see between the explanatory variable and the response variable in this study.
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