Margin of error at the confidence level
A population has a known standard deviation of 25. A simple random sample of 49 items is taken from the selected population. The sample mean (x-bar) is 300. What is the margin of error at the 95% confidence level?
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If a storage container has dimensions of 11.6ft X 9.8ft X16.2 ft and it is filled with nitrogen gas at a density of 4.57 g/L, what is the mass inpounds of the nitrogen gas in the container?
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Water and diethyl ether are immiscible liquids. Charged compounds dissolve in water and uncharged compounds dissolve in ether. Given that benzoic acid has a pKa of 4.8 and cyclohexylamine has a pKa of 10.7:
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A sample of the active ingredient in a nutritional mineral supplement was found to contain 0.0392 moles of iron, 0.0393 moles of sulfur, and 0.157 moles of oxygen atoms. What is the empirical formula of the ingredient?
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