impossible significance was not given 24. Which of the following statements comparing the standard normal distribution and the t distributions is false? (A) The density curve for Z is taller at the centre than the density curve for T. (B) The t distributions have more area in the tails than the standard normal distribution. (C) In tests of significance for u, Z should be used as the test statistic when the distri- bution of X is normal, and T should be used in other cases. (D) As the sample size increases, the t distributions approach the standard normal distribution. (E) In tests of significance for u, T should be used as the test statistic when the popu- lation standard deviation is unknown