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It is probably because Moroccan, Algerian, Tunisian, and Libyan, people back in the day migrated to Italy for better opportunities. And so they most likely spread the language and culture throughout Italy.
Answer:
These researchers are suffering from observer bias.
Explanation:
Observer bias is also known as <em>research bias</em> and it is the tendency an individual has to <em>see what he/she wants or expects to see</em>. The researcher allows his/her expectations about what will happen to <em>affect the study's results</em> because one's subjectivity comes into play, not really being objective.