Month employed Scales sold 41 275 106 249 76 317 100 252 22 162 12 150 85 267 135 245 40 189 51 235 83 12 86 67 56 325 19 189 Using piecewise linear regression (knot value - 80) model format (scales sold hat - bo + b1*(months employed) + b2*(months employed- the knot value)*(knot dummy variable)) in the exhibit 3 data, what is the estimated scales sold for someone with 83 months of employment? Oa. 80.71 Ob.317.61 OC 456.29 Od.222.55

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Equations and Inequations

Equations and inequalities describe the relationship between two mathematical expressions.

Linear Functions

A linear function can just be a constant, or it can be the constant multiplied with the variable like x or y. If the variables are of the form, x2, x1/2 or y2 it is not linear. The exponent over the variables should always be 1.