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An IT manager considers that the average number of hits per week on the company intranet pages should be 75. The mean number of hits per week on a random sample of 38 pages is 71.4 with a standard deviation of 31.9.
(a) Test a suitable hypothesis at the 10% level of significance to assess the plausibility of the IT manager's assertion.
(b) It later emerges that 18 of these pages are often visited by non-company users, and should therefore not be included in the sample. The mean and standard deviation of the remaining 20 pages are 65.8 and 28.3 respectively. Test the same hypothesis again at the 10% level. What assumption must you make for the test to be valid?
In the storage of flammable liquids, if the composition of the vapor-air mixture above the liquid surface falls within the flammability limits, a floating roof tank would need to used or the tank blanketed with inert gas. Check if the vapor compos..
Let the subset of those components given which have strictly positive initial concentrations. Give an algorithm to generate the set of components which are strictly positive for all subsequent (positive) times.
Determine the critical pressure ratio, the gas velocity at the throat, the expansion area ratio, and the theoretical nozzle exit velocity.
A spherical ball of benzoic acid (diameter = 1.5 cm) is submerged in a pool of still water. The solubility and diffusivity of benzoic acid in water are 0.03 kmol/m3 and 1.25 x 10-9 m2/srespectively.
What is the settling velocity in still air of a particle that is 40 µm in diameter and spherical? The particle has a density of 1400 Kg/m3. Use a density of 1.2 Kg/m3 and a viscosity
two important allotropes of elemental phosphorus are white phosphorus and red phosphorus a. why should gloves be worn
A 100-W light bulb is turned on. It has an operating voltage of 120 V.
The fuzzy sets in Example Problem 10.26 have been calibrated so that a person with a resting heart rate of 95 beats per minute has a 75% degree of membership in the normal category and a 25% degree of membership in the tachycardia category. A rest..
At steady state the temprature profiles in a laminated system appear as shown in figure. Which material has the higher thermal conductivity and Why ?
A boiler is fired using 200 kg /hr of pure saturated hydrocarbon gas ( Cn Hm ) at atmospheric pressure and 20 oc. The dry analysis of the flue gas which leaves the boiler at atmospheric pressure and 300 oc is CO2 =..
Design a column for this separation. The column will operate at essentially atmospheric pressure. Use a reflux ratio 1.5 times the minimum.
Equal rates of mass transfer for the production of the fine chemical are required. This is often required for certain types of organic synthesis.
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