1.A sample of 6400 cases is drawn at random from a large population.The Variance is 100.Calculate the standard error of the mean.

2.A sampleof thirty six (36) observations is taken from a normally distributed population with variance sixteen (16).Calculate a ninety-five (95) percent confidence interval corresponding to a sample mean of thirty five (35).

3.Calculate a ninety-nine (99) percent confidence interval for , where n = 100, sample mean = 38, and the standard deviation of the sample = 16.