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a) What are the control limits for X-bar control charts with \alpha = 0.002 probability limit and sample size of 4?
b) Assume the mean shift is 1.5sigma (sigma is the process standard deviation, that is, the standard deviation of individual observations), what is the probability of type II error under this mean shift?
the xyz inc. buys mother boards for its computer assembly. the following information is available use generally
A surgical technique is performed on seven patients. You are told there is a 70% chance of success. Find the probability that the surgery is successful for at least four patients.
the heights and weights of 11 men between the ages of 21 and 26 were measured. the data are presented in the table
The standard deviaiton is 2 pounds. If 15% of the suitcases are overweight, find the maximum weight allowed by the airline. Assume the variable is normally distributed.
Determination of Nominal, Ordinal, Interval, Ratio.Temperature is an example of what level of measurement.
the manager of a youth-oriented clothing store at the local mall has determined that 27 of the males who enter the
using the approximations for normal curves what percentage of scores fall between the mean and one standard deviation
when sample data actually occur in pairs an advantage of a paired t-test is that it tends to increase the power of a
Compute an exponential smoothing forecast with a =.20, an adjusted exponential smoothing forecast with a = .20 and B =.20 and a linear forecast. Compare the three forecast, using MAD and average error (E) and indicate which seem to be most accurat..
A university has found that 20% of its students withdraw without completing the introductory statistics course. Assume that 20 students have registered for the course this semester.
An insurance company is trying to determine if there is a significant difference in the average number of sick days that registered nurses and nurse practitioners use per year. The data analysis provided the following output.
you are estimating the manufacturing hours for an airframe based on the airframe weight. the airframe you are
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