The question of reliability/unreliability of a multiple ...

[mydiamond]

The question of reliability/unreliability of a multiple regression depends on
 
  A) internal but not external validity
  B) the quality of your statistical software package
  C) internal and external validity
  D) external but not internal validity

Question 2

The only difference between a one- and two-sided hypothesis test is
 
  A) the null hypothesis.
  B) dependent on the sample size n.
  C) the sign of the slope coefficient.
  D) how you interpret the t-statistic.

[nyrave]

Answer to Question 1

Answer: C

Answer to Question 2

Answer: D