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?
Each vehicle maintains a constant velocity after reaching its cruising speed. By what maximum distance does the bicycle lead the car?
In general, the attractive intermolecular forces between solvent and solute particles must be comparable or greater than solute-solute interactions for significant solubility to occur.
A ray of light strikes a flat block of glass (n = 1.50)of thickness 2.00 cm at an angle of 1/6 radian with the normal . Trace the light beam through the glass, and find the angles of incidence and refraction of each surface.
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:
What is the probability that Lisa smiles at Milhouse on exactly three days in a month? Use a Poisson approximation to calculate the probability that Lisa smiles at Milhouse on exactly three days in a month.
Let x be a random variable corresponding to the sum of the numbers on two fair dies(Hints, 2,3,4,....,12), Find the probability of P{x<8}.
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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