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Families usa, a monthly magazine that discusses issues related to health and health costs, surveyed 20 of its subscribers. It found that the annual health insurance premiums for a family with coverage through an employer averaged $10,979. The standard deviation of the sample was $1000.
A. Based on this sample information, develop a 90 percent confidence interval for the population mean yearly premium.B. How large a sample is needed to find the population mean within $250 at 99 percent confidence?
The difference between expected payoff under certainity and expected value of the best act without certainity is the expected:
In 2010, the average age of students at UTC was 22 with a standard deviation of 3.96. In 2013, the average age was 24 with a standard deviation of 4.08. In which year do the ages show a more dispersed distribution? Show your complete work and supp..
Assume that increasing and decreasing allergic reactions are equally likely if the training has no effect. Use alpha = .05
Create the 95% confidence interval for proportion of adults from Country A who say human activity contributes to global warming.
What percent of healthy young adults has osteoporosis by the WHO criterion? Suppose that the standard deviation is the same as for young adults. What percent of this older population has osteoporosis?
Assuming that the standard deviation is known to be 121.8Ib use 0.05 significance level to test the claim that the population mean of all such bear weights is greater than 150 Ib
Listed below are weights in grams from a sample of these bats. Construct a 95% confidence interval estimate of their mean weight.
Given that P (A) = 0.7, P (B) = 0.5, and P (A B) = 0.8. Find the following probabilities:
These can have a large impact on tenure and promotion decisions at many institutions. One particular instructor had ratings in 3 courses in one semester as given by the table below for the statement "The instructor is an excellent teacher.
The regression of Y on X predicts? When predicting Y, adding a second predictor variable to the first predictor variable X.
Management plans to sample 150 packages per week. What is the appropriate control chart?
In the end, of course, conclusions are drawn about how an entire population would respond based on the responses from randomly selected group of people.
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