Question

identify the examples of an experimental study.
example(s)
a researcher sifts through data about divorce rates and gas prices, looking for a correlation.
a researcher poses as a store clerk and documents several varieties of shoplifting behavior over a period of time.
a researcher compares the attitudes of two focus groups after each group watches a corporate training video. one video is narrated by a male voice, and the other, by a female voice.
a researcher deliberately drops a wallet in a public place and observes the reactions of passersby

Explanation:

Answer:

A researcher compares the attitudes of two focus groups after each group watches a corporate training video. One video is narrated by a male voice, and the other, by a female voice.