Battle of "sertanejos" on Instagram

revealing popular preference

Abstract

Stories are an Instagram resource for publishing images, videos, texts, feed publications, polls, and others. With the growing tendency to have battles on \textit{stories}, an open question is: who are the most beloved country singers in Brazil? 16 country artists were considered and were included in the list of the top 50 most played songs on Spotify Brazil. A random switch was drawn with 2^k$competitors, with k=4. About 100 people voted in each battle. The absolute and percentage frequencies were computed, fueling a parametric Bootstrap interval inference process, through the Beta distribution. 95% confidence intervals were constructed for the parameters a and b, and their intersections were verified. Singer Marília Mendonça won the championship. However, it was statistically equal to Henrique and Juliano, who came in second place. In third place were Jorge and Mateus and Zé Neto and Cristiano. In total there were 15 battles (2^k-1), but in only 5 of them there was a significant difference between the competitors: Marília Mendonça (2 wins), Jorge and Matheus (2 wins) and Israel and Rodolfo. The proposed methodology allows us to infer the difference between competitors, and thus, which ones won by pure chance.