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When circuit boards used in the manufacture of compact disc players are tested, the long-run percentage of defectives is 5%. Suppose that a batch of 250 boards has been received and that the condition of any particular board is independent of that of any other board.
a. What is the approximate probability that at least 10% of the boards in the batch are defective?b. What is the approximate probability that there are exactly 10 defectives in the batch?
What sample size would be needed to estimate he population mean to within one-half standard deviation with 95% confidence?
Provide the factorial notation for the following experimental design. Two independent variables:
Last chance for bonus points. In the over-identified case, we could estimate σ2 by fitting (6) to the data, and dividing the sum of the squared residuals by q - p. What's wrong with this idea?
Assume the population standard deviation is 1.2 hours. The standard error of the mean is:
a professor is interested in the number of students who use the campus library for academic purposes. she takes a
You are a consultant hired to review the instructional staff at the local community college. You have collected data from learner surveys regarding the instructors' performances. You have also collected data on the ratio of grades given by each in..
What is the opportunity loss of spending 4 hours per week on average studying for the exam when the exam turns out to be easy?
Briefly explain how sample size affect outcome of hypothesis test. How does sample size affect measures of effect size?
Environmental Protection Agency (EPA) fuel economy estimates for automobile models tested recently predicted a mean of 24.80 mpg and a standard deviation of 6.2mpg for highway driving. Assume that a normal model can be applied.
Develop one research question and formulate a hypothesis which may be tested with linear, bivariate regression analysis.
the average number of mosquitos in a stagnant pond is 70 per square meter with a standard deviation of 8. if a sample
The sample mean X will be used to estimate. Determine the probability that the estimate will be off by less than .2 oz. Assume that the SD of the fills is .8 oz.
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