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Daniel's research has shown that eating foods high in lycopene (an antioxidant) can be beneficial for heart health. Daniel wants to determine the most effective way to convince people to eat more food that contains lycopene. Daniel recruits 300 people from a shopping mall in Wisconsin. He tells them that if they watch a 5-minute video about eating healthy, they'll be paid $20. In general, these individuals aren't particularly interested in heart health or eating better. They also don't have any expertise in food science. Daniel assigns the participants to watch one of two videos:

Video #1 is narrated by Daniel. He starts by discussing the fact that lycopene is an antioxidant and it then carefully describes the biochemistry of antioxidants. He then talks about why antioxidants might be important for heart health. Finally, the message ends by saying that eating foods high in lycopene could enhance heart health. At each stage, Daniel logically and fully presents the scientific evidence underlying the claim.

Video #2 is narrated by members of the Milwaukee Brewers (the local professional baseball team). The players talk about why being healthy is important for them as successful athletes. They mention that they always eat foods with lots of lycopene to make sure they can play hard and feel healthy. The players don't present any scientific evidence or reasoning for why lycopene might be useful.
After each participant watches the video, Daniel has them fill out a survey indicating how likely they are to start eating more foods containing lycopene.

In the study described above, Daniel used what type of research method to assess the impact of the two videos (and the two types of persuasion they utilize)?