The research study that involved wrongly-addressed materials being sent to English households with the packages bearing either an English name or an Irish name was referred to as the

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The study described in the question is commonly referred to as the misdirected letter technique. The study involved sending wrongly-addressed materials (such as letters or parcels) to English households with either an English name or an Irish name, with the aim of testing whether people's willingness to help would be affected by the name on the package. The other options given (cognitive dissonance messaging, social distance scale, and "F" test) are not related to this particular study.

The Research Study That Involved Wrongly-Addressed Materials Being Sent to English