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4. Which of the following statements is not true? a) The sampling distributions of both proportions and means are approximately normal with mean equal to the population mean, as long as n is large enough. b) When comparing sampling distributions of sample proportions. the standard deviation for p =03 is greater than for p = 0.5, for any given sample size n. c) The sampling distribution of the sample proportion when p = 0.8 is more skewed than the sampling distribution of the sample proportion when p = 0.5 for any given sample size n. d) If a population proportion p is close to 0 or 1, then the sample size must be relatively large to produce an approximately normal sampling distribution for the sample proportion. e) For two values taken randomly and independently from two populations, the variance of the sampling distribution of the difference is equal to the sum of the variances