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For the basic age replacement model, consider a piece of equipment that costs $18,000 to replace.
The army is attempting to determine the optimal replacement age for a piece of field equipment. The equipment costs $280,000 to replace.
X- control charts are used to maintain control of the manufacture of the cases used to house a generic brand of personal computer.
What is the probability that this shift is detected on the first day after it occurs?
A maker of personal computers, Noname, purchases 64K DRAM chips from two different manufacturers, A and B.
A sample of 15 circuits is taken from each day’s production for 30 consecutive working days. A total of 17 defectives are discovered during this period.
A single sampling plan is used to determine the acceptability of shipments of a bearing assembly used in the manufacture of skateboards.
A double sampling plan is constructed as follows. From a lot of 200 items, a sample of 10 items is drawn.
Hammerhead produces heavy-duty nails, which are purchased by Modulo, a maker of prefabricated housing.
Enter the data into a spreadsheet and compute standardized Z values for a p chart. Graph the Z values. Is this process in control?
Samples of size 50 are drawn from lots of 1,000 items. The lot is rejected if there are more than two defectives in the sample.
Three hundred identical cathode ray tubes (CRTs) placed into service simultaneously on January 1, 1976.
If 300 items are still operating at time t = 1 year, approximately how many items would you expect to fail between year 1 and year 2?
A microprocessor that controls the tuner in color TVs fails completely at random (that is, according to the exponential distribution).
What are the essential differences among nominal, ordinal, interval, and ratio scales? How do these differences affect the statistical analysis.
Use the linear congruential method with parameters Z0 = 79, a = 56,214, c = 17, and m = 999 to generate 10 three-digit random numbers.
With a preliminary simulation of 10 days of operation of an emergency room, an analyst found the results.
The management of a major ski resort wants to simulate the rental program during the high season.*
Truckloads of seasonal merchandise arrive to a distribution center within a 2 week span.
The owner must decide how much space should be provided for waiting cars. This is an important decision since land prices are high.
Develop the balance equations and use them to determine the steady-state probability distribution for finding n customers in the system {Pn, n = 0, 1, 2, 3,...}
A mechanic is responsible for keeping two machines in working order. The time until a working machine breaks down is exponentially distributed with a mean.