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Question: A recent survey by Gen worth Financial Inc., a financial services company, concludes that the cost of long-term care in the U.S. varies significantly, depending on where an individual lives (The Wall Street Journal, May 16, 2009). An economist collects data from the five states with the highest annual costs (Alaska, Massachusetts, New Jersey, Rhode Island, and Connecticut) in order to determine if his sample data are consistent with the survey's conclusions. The economist provides the following portion of an ANOVA table:
a. Complete the ANOVA table.
b. Specify the competing hypotheses to test whether some differences exist in the mean long-term care costs in these five states.
c. At the 5% significance level, do mean costs differ?
The experiment uses volunteers rather than a random sample of all people suffering from acid reflux disease. Does this make the results invalid? Explain.
(a) Find the mean, variance, and range for these data and interpret. (b) Find lower and upper quartiles, median, and interquartile range. Check for any outliers. (c) Construct a box plot and interpret.
describe a scenario where you believe a binomial distribution would be appropriate. describe a scenario where you
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She randomly samples 67 CFOs and finds that 40 of them get their money news from newspapers. Does the test show enough evidence to reject the findings of Robert Half International? Use a = .05.
Suppose that a researcher does a study to see how level of anxiety (A 1 = low, A 2 = medium, A 3 = high) is used to predict exam performance (Y).
According to the 2006 National Occupational Employment and Wage Estimates for Management Occupations, the mean hourly wage for Chief Executives was $69.52.
the following sample data are from a normal population 1 19 11 12 2 2 12 19.a. what is the point estimate of the
A sample of the length of time it took 42 persons to assemble the unit was organized into the following frequency distribution. What is the standard deviation (in minutes)?
For a normal population with u. = 80 and a = 20 which of the following samples is least likely to be obtained?
examine the regression 90 confidence interval 90 prediction interval using 1990 and 2004 energy use kg oil equivalent
Translate the following arguments into symbolic notation. - Insurance companies contribute millions of dollars to political campaigns.
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