ZMean2Estimate Command

ZMean2Estimate[ <List of Sample Data 1>, <List of Sample Data 2>, <Population Standard Deviation σ1 >, <Population Standard Deviation σ2 >, <Level> ]

Calculates a Z confidence interval estimate of the difference between two population means using the given sample data sets, population standard deviations and confidence Level.

Results are returned in list form as {lower confidence limit, upper confidence limit}.

Example:

Two sample data list1 = {1, 4, 5, 4, 1, 3, 4, 2}, list2 = {2, 1, 3, 1, 2, 5, 2, 4} are given. The standard deviation of list1 is σ_1 = sqrt(2), the standard deviation of list2 is σ_2 =sqrt(1.75) and the confidence level is 0.75.

ZMean2Estimate[list1, list2, σ_1, σ_2, 0.75] yields list3={-1.73, 2.73}.

ZMean2Estimate[ <Sample Mean 1 >, <Population Standard Deviation σ1 >, <Sample Size 1>, <Sample Mean 2 >, <Population Standard Deviation σ2 >, <Sample Size 2>, <Level>]

Calculates a Z confidence interval estimate of the difference between two population means using the given sample means, population standard deviations and confidence Level.

Results are returned in list form as {lower confidence limit, upper confidence limit}.