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Question 662:

I need the formula to calculate z-score. My input is: Base Sample Size, Target Sample Size, Base Proportion, Target Proportion. I have a calculator that will give me the z-score, but I have to enter one at a time and have more than what I want to go through manually. Example: Base Sample Size: 142, Target Sample Size: 105, Base Proportion: .13, Target Proportion: .04. Z-score = -2.4224

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