If Xit is correlated with Xis for different values of s and t, ...

[krzymel]

If Xit is correlated with Xis for different values of s and t, then
 
  A) Xit is said to be autocorrelated
  B) the OLS estimator cannot be computed
  C) statistical inference cannot proceed in a standard way even if clustered standard errors are used
  D) this is not of practical importance since these correlations are typically weak in applications

Question 2

The following are properties of the logarithm function with the exception of
 
  A) ln(1/ x) = -ln(x).
  B) ln(a + x) = ln(a) + ln(x).
  C) ln(ax) = ln(a) + ln(x).
  D) ln(xa) a ln(x).

[sylvia]

Answer to Question 1

Answer: A

Answer to Question 2

Answer: B

[krzymel]

TYSM

[Perkypinki]

Excellent