Could you help on these problems?

Suppose we t a simple linear regression model ;- = 30 + 31331-1, but the response variable y is actually affected by a second variable 232 such that the true regression model is Ell/) = 130 + 13111721 + 13233152- Show that the least squares estimator Bl in the original simple linear regression model is not unbiased. In particular, show that n A 2(3311 531M330 532) 3 E1031) = 31 + 521:1 : {31 + {32 mm ($31 5'1? 331921 n i=1 and nd the bias in 31