Which of the following statements is not true? a) the standard deviation of the sampling distribution of sample mean = σ/√n b) the larger the sample size, the better will be the normal approximation to the sampling distribution of sample mean. c) the mean of the sampling distribution of sample mean is always the same as that of x, the distribution from which the sample is taken. d) the sampling distribution of the sample mean is always reasonably like the distribution of x, the distribution from which the sample is taken. e) the sampling distribution of sample mean is approximately normal, mound-shaped, and symmetric for n > 30 or n = 30.