Confidence interval for the mean bill
A random sample of 25 lunch orders at Noodles and Company showed a mean bill of 10.36 with a asample standard deviation of 5.31$. FInd the 95% confidence interval for the mean bill of the lunch orders.
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Vinegar is a solution ofacetic acid, CH3COOH, dissolved in water. A 5.54-gsample of vinegar was neutralized by 30.10 mL of 0.100 M NaOH. What is the percent by weight of acetic acid in the vinegar?
What will be the temperature of the steam after the expansion? What would be the downstream temperature if the stream were replaced by an ideal gas, Cp/R=7/2?
A vessel of cross section 20 cm2 has at the bottom a horizontal capillary tube of length 10 cm and internal diameter 0.5 mm. It is initially filled with water to a height of 50 cm. Find the time taken to empty one half of the content in the vessel
A 250. mL sample of 0.0328M HCl is partially neutralized by the addition of 100. mL of 0.0245M NaOH. Find the concentration of hydrochloric acid in the resulting solution.
An overall balance around part of a plant involves three inlets and two outlets which only contain water. What is the heat interaction for this portion of the plant in kW? Is heat being added or removed?
Calculate the de Broglie wavelength of the following: (a) a 1.00g bullet with a velocity of 300 m/s (b) An H2 molecule with a kinetic energy of 3/2 kT at a Temperature of 20.0 K
A random sample of 10 items is drawn from a population whose standard deviation is unknown. The sample mean is 270 and the sample standart deviation is s=20.
What is the minimum amount of solvent needed to recrystallize 0.200 g of phenacetin? How much would be lost in the recrystallization?
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