Question: In StatsTools, I need a step-by-step tutorial on how to set up the following question: Assume that Elecmart has a customer base of 600,000 customers

In StatsTools, I need a step-by-step tutorial on how to set up the following question:

Assume that Elecmart has a customer base of 600,000 customers nationwide, and that the samples sizes (i.e., number of observations) from each of the regions are proportional to the customer populations in each of the regions. In this case, find a 95% confidence interval for the total dollar volume of sales (for all customers) in each of the different regions.

I have 4 regions that have different sample sizes.

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