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To help shape her promotional strategy, the general manager of a regional airport wants to know how far passengers travel to use the airport. The mean and standard deviation of the distances travelled by a random sample of 61 passengers were 24.1 miles and 5.8 miles respectively.
(a) Find a 90% confidence interval for the mean distance travelled by passengers.
(b) If the population standard deviation were later found to be 6.3 miles, what size sample would be needed in order to estimate the mean distance travelled by passengers for the error to be one mile with a 90% level of confidence?
what is the thermal efficiency of the cycle and what fraction of the steam entering the turbine is extracted for each feedwater heater?
A particle with the mass of a proton is trapped in a box. The particle falls from the state to the state and emits 0.16 meV of energy. What is the size of the box? (nm
Find the ratio of the speed of the generator to the speed of the motor when the total line current is 80 A in both cases.
Draw T-S diagram of the cycle.
Estimate the heat-transfer coefficient for steam condensing on the outside, and on the inside, of a 25 mm o.d., 21 mm i.d. vertical tube 3.66 m long. The steam condensate rate is 0.015 kg/s per tube and condensation takes place at 3 bar
On the basis of the general solubility rules given in Table 4.1, predict which of the following substances are likely to be soluble in water.
The blood shows 48 counts per minute of radioactivity. Calculate the volume of blood in the rat. What assumptions must be made in performing this calculation?
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B is open to the atmosphere. the specific gravity for oil is 0.8, the distance h= 4 inches and the distance d= 6 inches. find the gage pressure and absolute pressure at A
Think about how a growth factor would work to attract the cell to the surface and how these proteins could be anchored to the surface so that this functionality is not compromised.
The Cookenwythe Gas Company pumps propane gas to the nearby Noxious Chemicals, Inc., polypropylene production plant. The gas is metered at the noxious plant at 400m3/h at 4.7atm gauge and 30°C.
What must be the area of a parallel plate capacitor, with plates separated a distance d = 0.01 mm and relative permittivity of 4 for the dielectric between the plates to supply the same charge as the battery in (a)?
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