A study carried out in Ponce and Mayagez, in the year 2021, found that 37% of people are vaccinated against seasonal influenza. After having carried out a promotional campaign, in the past months, to encourage people to get vaccinated against seasonal influenza, a sample (n) of 100 people was taken in the medical offices of the cities of Ponce, Cabo Rojo, Mayagez and Aasco. . The findings reflected 45 of the people are vaccinated against seasonal influenza.

a. Use 5% significance level. Can we conclude that the proportion of people vaccinated against seasonal influenza has increased?