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Control chart for x bar is maintained on a quality characteristic which is normally distributed.
The sample size is n=4. Consider one-sigma warning limits for this chart. Instead of typical rules for control charts, the company has decided to use only the following rule; if at least two of three consecutive points are greater than upper warning limit ( UWL = mu + alpha) or at least two of three consecutive points are less than lower warning limit ( LWL = mu - alpha), the process will be considered out of control. What is the ARL for the in-control process?
How many departments would they need to survey to achieve this level of accuracy with 95% confidence?
For a t distribution with 16 degrees of freedom, find the area, or probability, in each region.
This information was also obtained from monitored calls. At the .05 significance level does it take longer to resolve software issues? What is the p-value?
In which of the following markets do all firms sell the same standardized product?
Any value which is based on having measured a sample is called:
Find the minimum amount of water pumped in 30 days. Let y be the total number of gallons pumped x days after pumping being. Note that (0,0) is on graph of the equation.
suppose a consumer group asked 18 consumers to keep a yearly log of their shopping practicesand that the following data
1 assume that a radiologist group practice has the following cost structurefixed costsnbspnbspnbspnbsp
Mighty Manufacturing must decide on the processes to use to produce 1650 units. If machine 1 is used, its production will be between 300 and 1500 units. Machine 2 or machine 3 can be used only if machine 1's production is at least 1000 units. Ma..
What is your decision regarding the null hypothesis and interpret.
The lifetime of a disk drive head is normally distributed with a population mean of 1000 hours and a standard deviation of 120 hours. Determine the probability that the lifetime for 9 disk drives will exceed 940 hours.
a random sample of 144 observations has a mean of 20 a median of 21 and a mode of 22. the population standard deviation
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