A recent study showed that teenagers who had night lights in their rooms as babies are more likely to suffer from myopia near

Question

A recent study showed that teenagers who had night lights in their rooms as babies are more likely to suffer from myopia near sightedness than teenagers who had not used night lights But genetic factors are known to play a role and near sighted parents are more likely to install a night light in their children s room This makes it hard to tell if the night light caused the myopia This is an example of O the placebo effect O double blinding O an explanatory variable

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