Question: To determine whether using a cell phone while driving increases the risk of an accident, a researcher examines accident reports to obtain data about the

To determine whether using a cell phone while driving increases the risk of an accident, a researcher examines accident reports to obtain data about the number of accidents in which a driver was talking on a cell phone.

a. Is this a randomized experiment or an observational study?

b. Assume that the accident reports show that people were more likely to have an accident while talking on a cell phone.

Could this result be due to confounding? Explain.

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