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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?
The overall reaction in a commercial heat pack can be represented as: 4Fe(s)+ 3O2(g) yields 2Fe2O3(s); delta H=1652 kJ a. How much heat is released when 4.00 mol iron is reacted with excess O2?
PART - A . Using the following data, draw up a heat balance for a steel ingot soaking pit for a twenty hours test period during which 130 tons of cold steel ingots were heated from 20 oc to 1220oc.
Write a function called int_col that has one input argument, a positive integer n that is greater than 1,and one output argument v that is a column vector of length n containing all the positive integers smaller than or equal to n, arranged in suc..
Assume that the absorption coefficient is 0:1 cm-1, the scattering coefficient of a 5-cm thick tissue is 100 cm-1, the scattering anisotropy is 0.9, and the wavelength of light is 0:5 mm. Calculate the light fluence rate 5 cm from the source.
question 1suppose the system shown below. initially the gas is at 200 kpa and occupies a volume of 0.1 m3. the spring
At several flow rates, verify the flow meter readings by checking the paddle wheel meter and rotameters using timed weighings.
Draw highly magnified views of each solution individually, and the mixed solution including any product that forms. Write the balanced equation for the reaction. What do you think of your sketch, and what do you think this says about the nature of..
The data in Table 1 were obtained from a kinetic study of an enzymatic reaction. The substrate S (with a concentration s) was converted, using an enzyme, to a product in 4 different experimental runs. The initial conditions of each experiment (initia..
By using the mesh-current method, determine the voltage across the 1-A current source of the circuit of Figure P2.2.7, and verify by nodal analysis.
Determine how much power could be removed by free convection and radiation from the lateral and the upper horizontal surfaces when the ambient temperature and the surroundings are at 27°C.
Discuss the consequent effects on the real and reactive power losses, and on the voltage drop across the series impedance of the transmission system.
A gas stream contains 18.0mole% hexane and the remainder nitrogen, the stream flows to a condenser, where its temperature is reduced and some of the hexane is liquefied.
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