Mathematics 30-2: Module 4 25 c. The scatterplot represents a study done by a particular group of psychologists who study memory recall time, in seconds, with a different number of items. (Let x represent the time, in seconds, and y represent the number of items.) The equation of the cubic curve of best fit is y = 0.037x3 - 0.79x7 + 4.74x + 4.27. 20 18 16 14 12 10 8 6 4 2 X 0 2 4 6 8 10 12 14 16 i. Make up a question that would involve interpolation and the use of the model (regression equation) to solve. Provide the solution. (3 marks) li. Make up a question that would involve extrapolation and the use of the model (regression equation) to solve. Provide the solution