As the sample size decreases, the confidence interval for the population mean will a. decrease b. increase c. stay the same d. decrease and then increase

Which of the following best describes the shape of the sampling distribution of the sample proportion? a. When standardized, it is exactly the standard normal distribution. b. When standardized, it is the t distribution. c. It is approximately normal as long as n 30. d. It is approximately normal as long as np 10 and n(1-p) 10. e. None of these are correct.