In an advertising company, a survey was carried out on 30 employees about the usefulness of electronic devices in their day-to-day life and in their work environment. The objective of the survey was to identify whether the prohibition or restriction of cell phones during the working day improved productivity. The results of the survey are shown below: Per day, how much time (in hours) do you spend in front of the cell phone screen? 2 0.8 1.2 2.2 3 5.2 1.5 1 1 2 4.7 4.3 4 2.3 3.8 4.2 4 4.9 3.8 2 3.5 1.5 2.5 3.2 4.3 4 3.9 3 3.5 3.6