| Row | Statistical Model | Elasticity |
| 1 | \(y_t=β_1+β_2\frac{1}{x_t}\epsilon_t\) | \(-\frac{β_2}{x^2_t}\) |
| 2 | \(y_t=β_1-β_2\text{ln}(x_t)+\epsilon_t\) | \(-\frac{β_2}{x^2_t}\) |
| 3 | ln(yt) = β1 + β2 ln(xt) + εt | β2 |
| 4 | ln(yt) = β1 + β2xt + εt | β2xt |
| 5 | ln(yt) = β1 + β2 ln(xt) + εt | β2 exp(xt) |
| 6 | ln(yt) = β1 + β2xt + εt | \(β_2\frac{1}{\text{exp}(x_t)}\) |
Fill in the blank with the correct option.
The teacher believed that the student’s sudden lack of interest in class was an ..........., as he had always been enthusiastic and attentive.