Question: Refer to the study reported in Example 2.2, relating the use of nightlights in childhood and the incidence of subsequent myopia. a. Was the research

Refer to the study reported in Example 2.2, relating the use of nightlights in childhood and the incidence of subsequent myopia.

a. Was the research based on an observational study or a randomized experiment? Explain.

b. Which one of the “difficulties and disasters” in Section 6.4 do you think is most likely to be a problem in this research? Explain.

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