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    What are these formulas and what is their purpose? n=(sigma^2)(Z_alpha/h^2); two more

    I can't find reference to these formulas in the slides posted by my professor. I also can't find any versions of these formulas anywhere else online - guess my google-fu sucks. I get what Z_alpha is (critical value), I know what sigma is (population standard deviation), and n I guess is the...