Which market research technique did Warner Bros. famously use to alter the ending of 'I Am Legend' (2007) after negative audience reactions?

In the high-stakes world of film production, studios employ sophisticated market research techniques to minimize financial risk and maximize audience appeal. From test screenings to focus groups, these methods help shape everything from casting decisions to marketing campaigns. This trivia question explores one of Hollywood's less-known but highly influential market research practices that has shaped many blockbusters you've enjoyed.

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Test screening with focus groups
Social media sentiment analysis
Neuromarketing and eye-tracking studies
Demographic overlay mapping