Explain clearly

QUESTION 5 Which one of the following assumptions is known as the spherical disturbance assumption? E( Ut | X- ) = 0 E(u [ X) = 0 O plim (X'X ) = S, where S is a positive definite matrix. Var(u) = 02 1, where I is an identity matrix of appropriate size. up is normally distributed. QUESTION 6 Which one of the following statements is false? (you can select more than 1 answer) Homoskedasticity means that all the error terms have the same variance. Heteroskedasticity means that all the error terms have the same variance. Autocorrelation is permitted under the spherical disturbance assumption. Heteroskedasticity is permitted under the spherical disturbance assumption. Autocorrelation means that the error terms ut are i.i.d