11". What is the estimated value of' the slope parameter when the regression equation, 32 = I] + 111 + it passes through the origin? C- 21135:?! 1 a 2,- [LEM III [3": 'f'2 18. Consider a simple linear regression model, wage = k + lmm'a + u, where male is a binary variable {1 if a person is male, and [t otherwise}. Now suppose that we know being a male means there is a lower probability of attaining higher educationI another factor that is also expected to affect wage. 1vith'l'iicli of the key assumptions made to establish unbiasedness of 0L5 estimates do not hold? a. Linear in parameters b. Random sampling c. Sample variation in the explanatory variable d. Zero conditional mean