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Twenty-five samples of size 4 resulted in statistics of x=30.0 minutes and R = 2.5 minutes for the company to completely clean a rug. Compute control limits for x- and R-charts and estimate the standard deviation of the process.
A sample of 16 patients in a doctors office showed that they had to wait an average of 43 minutes with a standard deviation of 8 minutes before they could see doctor. Provide a 99% confidence interval for the average waiting time for all of the pa..
Increasing the confidence-interval level from .95 to .99
Mean threshold values and standard deviations for the three groups are given below. Normal probability plots showed the three populations were well approximated by the Normal distribution.
What would that evaluation be and what is the margin of error?
What is the real world value of the y-intercept and slope in a regression equation? Other than statistics problems, why should I care?
Calculate table T t . Calculate Computed T c .
Transportation problem using the stepping stone method
A description of a Pew Research Center poll referred to "the random generation of the last two digits of telephone numbers." Each digits has the same chance of being randomly generated. Construct a table representing the probability distribution f..
It is really frustrating to run out of stock. Why wouldn't an organization always store large quantities of inventory to eliminate shortages and stockouts?
A random sample of 58 fish is taken from the tank. Let x be the mean sample length of these fish. What is the probability that x is within 0.5 inch of the claimed population mean? (Round your answer to four decimal places.)
Determine the z values for 29 and 34 hours. What percent of the garages take between 32 hours and 34 hours to erect?
A bank's loan officer rates applicants for credit. The ratings can be described by a Normal model with a mean of 200 and a standard deviation of 50.
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