# ZMean2Estimate Command ##### Command Categories (All commands)

ZMean2Estimate( <List of Sample Data 1>, <List of Sample Data 2>, <σ1>, <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 = {-0.29, 1.29}.

ZMean2Estimate( <Sample Mean 1>, <σ1>, <Sample Size 1>, <Sample Mean 2 >, <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}.
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