A certain experiment produces the data (1, 1.6), (2, 2.8). (3, 3.2), (4, 3.8), and (5, 4.1). Describe the model that produces a least-squares fit of these points by a function of the form y-81 x + β2xf. Such a function might arise, for example, as the revenue from the sale of x units of a product, when the amount offered for sale affects the price set for the product. a. Give the design matrix and observation vector for the unknown parameter vector β=
b. Find the associated least-squares curve for the data