Scarlett is a graduate student who is observing children playing together after watching a film. She knows that some children saw a film that contained graphic scenes of violence and some children saw a non-violent film, but she doesn't know which film each child she is observing watched. In this case, Scarlett is recording data for .

a double blind research study                                                

Explanation:

Double-blind study: In psychological research, the term "double-blind research study" is described as one of the research studies whereby neither the experimenter nor the participants or subjects know about the specific treatment being received by the participants.

A "double-blind research method" is being utilized to avoid or ignore bias in the results because of the placebo effect or demand characteristics.

In the question above, Scarlett is recording data for a "double-blind research study".

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the earthquake in haiti was a magnitude of 7.0 according to the u.s geological survey yet the smaller earthquake in haiti killed more than 200,000 and left more than 1.2 million people homeless. the chile earthquake was a magnitude of 8.8 and 500 times more stronger but chile's earthquake only injured 712 people.