A set of data is given. t Y 0.1 20.6 0.2 23.4 0.3 24.5 0.4 21.6 0.5 17.7 0.6 11.7 0.7 5.9 0.8 1.9 0.9 1.1 1.0 3.5 1.1 7.8 1.2 13.7 1.3 18.5 1.4 23.5 1.5 24.6 (a) Make a scatter plot of the data. 30 25 20 15 50 10 30 25 20 15 10 . (a) Make a scatter plot of the data. 30 y 25 20 15 10 5 0.5 1.0 1.5 30 25 20 15 10 5 30 30 25 WebAssign Plot 25 20 20 15 15 10 10 5 5 0.5 1.0 1.5 t 0.5 1.0 1.5 0.5 1.0 1.5 (b) Find a cosine function of the form ya cos(a(t-c)) +b that models the data, as in Example 1.