study concluded that children who slept with a nightlight or fully lit room before 2 years old had a higher incidence of myopia later in adulthood. What other variables could have influenced this finding?
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Does sleeping with a nightlight or in a fully lit room before the age of 2 lead to myopia? For 479 children, it was recorded if the child slept with darkness, nightlight, or full light and whether the child developed no myopia, moderate myopia, or severe myopia. Using the information presented in the table, what proportion of children had moderate myopia? Slept with No Myopia Moderate Myopia Severe Myopia Total Darkness 155 15 2 172 Nightlight 153 72 7 232 Full Light 31 36 5 75 Total 342 123 14 479 0.1566 0.2568 0.0292 0.3591
Qudsiya A.
Following table and graph display the data from this study: What does the data suggest about the association between near-sightedness and higher levels of light exposure? Support your answer using conditional percentages. Is it valid to conclude that sleeping in a lit room with night light causes risk of near-sightedness? Why or why not? Identify at least one confounding variable. Explain how this variable might be responsible for the association between the explanatory variable and the response variable.
Adi S.
Researchers at the University of Pennsylvania School of Medicine have determined that children under 2 years old who sleep with the lights on have a 37% chance of becoming myopic before they are 16. Children who sleep in darkness have a 25% probability of becoming myopic. A survey indicates that 30% of children under 2 sleep with some light on. Find the probability that a random child under 2 will become myopic before reaching 16 years old.
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