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Assume that in Example 36.3 the number of samples was 8 instead of 10. Using the top half of the data in Table 36.4, recalculate the control limits and the standard deviation. Compare your observations with the results obtained by using 10 sample
Example 36.3
The data given in Table 36.4 show length measurements (mm) taken on a machined workpiece. The sample size is 5, and the number of samples is 10; thus, the total number of parts measured is 50. The quantity x is the average of five measurements in each sample. Determine the upper and lower control limits and the standard deviation for the population of machined parts.
Wastewater flow of 2000 m3/day containing 120g/L of salt. Discharge into a river with a flow of 34,000 m3/day and a salt concentration of 50 mg/l. The agency wants to maintain the salt level to no greater than 250 mg/L downstream of the discharge.
A 1.50 L buffer solution is 0.250 M in HF and 0.250 M in NaF. Calculate the pH of the solution after the addition of 0.0500 moles of solid NaOH. Assume no volume change upon the addition of base. The Ka for HF is 3.5 x 10 -4 .
A community has a current population of 15,000. 10 years ago, the population was 12,500 and the community has a declining growth rate with a saturation population of 22,000. The total water consumption for the community at present is 2.25 million gal..
Calculate the time constant for such a thermocouple when exposed to an airstream with a convection heat-transfer coefficient of 100 W/m2 · ?C.
the t-component of the force f is known to be 75n. determine the n-component and the magnitude of f.
Find an estimate of the concentration of CO at 6 PM if there was no CO in the air at 4 PM. (Assume that CO is conservative and that there is instantaneous and complete mixing in the box)
A rectangular channel of 2 m depth and 5 m width carries 1 m deep running water. It is laid to a slope of 0.001 with Manning's n = 0.02. Some distance downstream there is a hump of height 0.5 m on the stream bed.
Suppose that the acceleration of the train during the interval time from t=2 to t=4 s is a 2t m/s^2, and at t = 2 s its velocity is v = 180 km/hr. What is the train's velocity at t = 4 s
Stripping overburden in the Illinois coal belt, the Dusty Coal Company uses 270-horsepower, track-type tractors (with direct-drive transmissions) and drawn scrapers.
A small, powered hand drill is driven by an electric motor running at 3000 rpm. The drill speed is to be approximately 550 rpm. Design the speed reduction for the drill. The power transmitted is 0.25 hp.
Name the four major strength related tests of road aggregates.
Laboratory clean rooms are often kept at a slightly higher pressure than ambient pressure in order to flush out particulates and keep dust from getting in. If the pressure in such a room is equivalent to 1 mm water greater than the surrounding rooms
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