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Recall the use of data from the National Health Survey to estimate behaviors such as alcohol consumption, cigarette smoking, and hours of sleep for all U.S. adults. In the 2005-2007 report, they estimated that 30% of all current smokers started smoking before the age of 16.
Suppose that we randomly select 100 U.S. adults who are smokers and find that 25% of this sample started smoking before the age of 16. Is this much error surprising? Find the probability that a sample proportion will be an over- or underestimate of the parameter by more than 5%.
Effective Yield Rollins, Inc., has $3 million in cash available for 180 days. It can earn 7 percent on a U.S. Treasury bill or 9 percent on a British Treasury bill.
Assume we have a population of scores with mean (mu) of 200 and standard deviation (sigma) of 10. Assume that the distribution is normal. Provide answers to the following questions:
a. Specify the null and alternative hypotheses to test the diet center's claim. b. Calculate the value of the test statistic T.
Demonstrates clearly and fully the ability to use Excel to perform the correlation for the data set.
Calculate the coefficient of determination, given that the linear correlation coefficient, r, is -0.625. What does this tell you about the explained variation and the unexplained variation of the data about the regression line?
a product is made up of two subsystems in series. the first subsystem consists of 15 components in series. the second
The price-earnings ratios of a sample of stocks have a mean value of 13.5 and a standard deviation of 2. if the ratios have a bell-shaped distribution, what can we say about the poportion of ratios that fall between 9.5 and 17.5?
Lifetimes of AAA batteries are approximately normally distributed. A manufacturer wants to estimate the standard deviation of the lifetime of the AAA batteries
Given a plant with transfer function (s) = (s - 1)/(s2 - 4), find a compensator in the unity-feedback configuration so that the overall system has desired poles
the life expectancy of point-of-sale pos terminals is normally distributed with a mean of 4 years and a standard
Determine the sampling distribution of X. x 30 37.5 45 47.5 55 65 p(x) Calculate E(X). E(X) = oz Compare E(X) to µ. E(X) > µ E(X)
For a typical telephone order, determine the probability that neither computer system will be operational.- both computer systems will be operational.
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