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Collinsville Construction Company purchases steel rods for its projects. Based on previous tests, Claude Carter, Quality Assurance Manager, has recommended purchasing rods from Redding Rods, Inc. (population 1), rather than Stockton Steel (population 2), since Redding's rods had less variability in length. Recently, Stockton revised it rod shearing operation, and Claude has sampled the outputs from Redding's and Stockton's rod manufacturing processes. The results for Redding were s12 = 0.10 with n1 = 8, and, for Stockton, the results were s22 = 0.05 with n2 = 10. Assume that rod lengths are normally distributed in the population. If α = 0.05, the observed F value is
Consider the trash bag problem. Suppose that an independent laboratory has tested trash bags and has found that no 30-gallon bags that are currently on the market have a mean breaking strength of 50 pounds or more.
according to the 2010 us census approximately 19.4 of persons aged 65 or over live in the northeast 22.4 in the midwest
An oil executive has determined that the probability that this oil field contains oil is 0.6. Before starting the drilling she decides to order a seismological test to see if there is oil in the ground.
You have successfully won a project. Give an example of a internal and external communication barrier and how they were overcome.
describe a fictional two-group experiment that could be tested with an independent t-test but violates the assumption
what are the appropriate h0 and ha for each of the following research studies? in addition note whether the hypothesis
A sample of 15 female collegiate golfers was selected and the clubhead velocity (km/hr) while swinging a driver was determined for each one, resulting in the following data ("Hip Rotational Velocities During the Full Golf Swing," J. of Sports Sci..
Using a separate 2 by 2 table, compute predictive value positive and predictive value negative for population of 1,000 drug users.
The average doctor's visit is 17 minutes with a standard deviation of 9 minutes. A researcher uses a sampling distribution made up of samples of size 180.
Estimate the proportion of all houses that have brick cladding - suggest that the proportion houses sold that don't have heating could be less than 65%?
Find the probability that the number who say oatmeal is their favorite cookie is (a) exactly four, (b) at least four, and (c) less than four.
The schools' most serious problem. Results from a Gallup Youth Survey reveal that teens most often mention "violence, fighting, and school safety".
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