Question 1.[4.5 marks] A football coach is interested in modeling the players' speed (as a measure of strength), as a function of the training hour during a week. The table below contains data collected from 16 selected players.

Player Weekly training time Player's speed (hours) (km/h) 1 12 25 2 13 25.3 14 25.7 4 15 26.9 5 16 27 6 17 26.8 7 18 28 8 19 27.9 9 20 29.1 10 21 29.2 11 22 32 12 23 31 13 24 32 14 25 33.2 15 26 33.9 16 27 34.8