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Consider given Exercise, which deals with the average wait time for the arrival of a cab. Using the data in Table 7-25, construct a geometric moving-average control chart. Use a weighting factor of 0.10. What conclusions can you draw from the chart? How is it different from the moving-average control chart constructed in Exercise?
Exercise The average time (minutes) that a customer has to wait for the arrival of a cab after calling the company has been observed for random samples of size 4. The data for 20 such samples are shown in Table 7-25. Previous analysis gave the upper and lower control limits for an X-chart when the process was in control as 10.5 and 7.7 minutes, respectively. What is your estimate of the standard deviation of the waiting time for a customer? Construct a moving-average control chart using a span of 3. What conclusions can you draw from the chart?
the following is a frequency distribution fo the number of times patience use the call light in a days time. x is the
The total cholesterol level of US females 2 years old or older is normally distributed with a mean of 206 mg/dl and a standard deviation of 44.7
a) Based on current equipment: What is profit when selling 35,000 units? b) Based on new equipment: What is profit when selling 60,000 units? c) Based on your profit calculations-should the company buy the new equipment?
a town has a population of exactly 10000 people.a what is the mean and standard deviation of the number of people
Give an example for each of the following distributions, binomial, hypergeometric, and Poisson. Explain the differences and different characteristics.
Suppose that we are interested in the proportion of the 70 students in the lunchroom cafeteria that smokes. Is the normal approximation for the proportion p = r/n valid?
Construct a normal probability plot for the fatigue-crack propagation data given in Exercise 39 (Chapter 1). Does it appear plausible that propagation life has a normal distribution? Explain.
A position control system for a DC motor is shown in Figure AP7.8. Obtain the root locus for the velocity feedback constant K, and select K so that all the roots of the characteristic equation are real (two are equal and real).
the use of a tremendously large sample does not solve the question of quality for an estimator. what problems do you
Two mercury manometers, one open-end and the other sealed-end, are attached to an air duct. The reading on the open-end manometer is 28 mm and that on the sealed-end manometer is 809 mm.
Obtaining uniform random numbers as instructed at the beginning of the Problems section, generate four random observations from an exponential distribution with mean = 1.
You are presented a 90% confidence interval for the difference in population mean scores (with drug - without drug) of (-17.81, -7.24). What can you conclude from this interval?
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