To determine whether using a cell phone while driving in Louisiana increases the

Question

To determine whether using a cell phone while driving in Louisiana 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. What is the population being studied here? c. Is the number of accidents where the driver was using a cell phone a qualitative or quantitative variable? d. Is the number of accidents where the driver was using a cell phone an ordinal, nominal, continuous, or discrete variable? e. What kind of sample is taken if the researcher only examines accident reports in the parish in which he lives?

Explanation / Answer

Part-a

This is an observational study as researcher simply obtained data and did not assigned drivers to groups with and without cell phones.

Part-b

Population is of all drivers

Part-c

Number of accidents is quantitative variable as difference is meaningful.

Part-d

Number of accidents is discrete variable as it takes on integer value>=0

Part-e

This would be a convenient sample as surrounding drivers data is taken

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