'Sample Mean Distributions
A population consists of the four numbers 3,7,11,15. Consider all possible samples of size two that can be drawn with replacement from this population_ Find (a) the population mean, (b) the population standard deviation; (c) the mean of the sampling distribution of means, (d) the standard deviation of the sampling distribution of means: Verify (c) and (d) directly from (a) and (b) by use of suitable formulas: 13. Solve Problem 5.49 if sampling is without replacement:'