Which of the following statements are true? I. The sampling distribution of xx has standard deviation nn even if the population is not normally distributed. II. The sampling distribution of xx is normal if the population has a normal distribution. III. When nn is large, the sampling distribution of xx is approximately normal even if the the population is not normally distributed.

• I and II
• I and III
• II and III
• I, II, and III
• None of the above gives the complete set of true responses.