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A photoconductor film is manufactured at a nominal thickness of 25 mils. The product engineer wishes to increase the mean speed of the film, and believes that this can be achieved by reducing the thickness of the film to 20 mils. Eight samples of each film thickness are manufactured in a pilot production process, and the film speed (in microjoules per square inch) is measured. For the 25-mil film the sample data the mean is found to be 1.15 and the standard deviation is observed as 0.11, while for the 20-mil film, the data yield a mean value of 1.06 and standard deviation value of 0.09.
a) Suppose that one population standard deviation is 50% larger than the other. Is the sample size n1=n2=8 adequate to detect this difference with a probability at least 0.90? Use α=0.01.
Hagger Engineering Corporation is considering undertaking several proposed projects for the next fiscal year. The projects, the number of engineers and the number of support personnel necessary for each project.
Compare the average queueing delay (waiting and service) of an M/G/1 queue with following queueing disciplines: (arrival rate=0.5, average service time=1)
The sensitivity of a drug test is the probability that the test will be positive when administered to a person who has actually taken the drug.
You are unable to assume any theoretical results such as the central limit theorem. Discuss how you would empirically determine the sampling distribution of the new statistic.
1.do students tend to improve their sat mathematics sat-m score the second time they take the test? a random sample of
Based on this, what is the probability that the mean weight of the bales in a sample of n=64 bales will be between 78 and 82 pounds?
Describe a situtation in your experience when skepticism helped you arrive at a conclusion about a specific claim that you have encountered.
Suppose a survey item asks someone if something is very important, somewhat important, not very important, or unimportant. This is an example of what level of measurement?
Assume you have noted the following prices for paperback books and the number of pages that each book contains.
What is the mean of the sampling distribution? What is the standard deviation of the sampling distribution? What is the probability that the mean tuition and fees of the sample is greater than $20,000?
What is the R and adjusted R-square for all independent variables entered simultaneously and what variables provide a significant unique contribution(s)?
Travel and Transportation To advertise appropriate vacation packages, Best Bets Travel would like to learn more about families planning overseas trips.
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