Explain the difference between testing a single mean and testing the difference between two means. What two assumptions must be met when one is using z test to test differences between two means? When can the sample standard deviations s 1 and s 2 be used in place of the population standard deviations s 1 and s 2?© BrainMass Inc. brainmass.com June 3, 2020, 9:05 pm ad1c9bdddf
Single mean and difference between two means and standard deviations are discussed. The solution is detailed and well presented.