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Based on a survey of 1,000 adults by Greenfield Online and resported in a May 2009 USA Today Snapshot, adults 24 years of age and under spend a weekly average of $35 on fast food. If 200 of the adults surveyed were in the age catetory of 24 and under and they provided a standard deviation of $14.50, construct a 95% confidence interval for the weekly average expenditure on fast food for adults 24 years of age and under. Assume fast food weekly expenditures are normally distributed.
When the level of confidence and sample size remain the same, a confidence interval for a population proportion π will be __________ when p(1-p) is larger than when p(1-p) is smaller.
Suppose the investor is to invest a total of $10,000, what is the expected value of perfect information for investor.
Critically discuss the auto-covariance function of a stationary time series and its basic properties.
26% of college students say they use credit card because of the rewards program . You randomly select 10 college students and ask each to name the reason he or she uses credit cards.
what are the probability of you having the disease?
Suppose that you are conducting a survey of customer satisfaction regarding their cellular phone. If you called 11 households selected at random, what is the probability that:
Compute the Kappa statistic and its standard error regarding reproducibility of the diagnosis of dyspnea in the clinic.
Explain these results to a person who understands the t test for a single sample but knows nothing about the t test for independent means.
Explain clearly, in your own words, what is a Type I error in this context.
Acme plumbing supply just received a shipment of 5,000 stainless steel valves, but 50 regular steel valves were also sent. There is no way to tell the difference between the valves.
Identify the population and the sample: A survey of 787 small-business managers found that 72% are optimistic about the future of their company.
A sample of 16 patients in a doctors office showed that they had to wait an average of 43 minutes with a standard deviation of 8 minutes before they could see doctor. Provide a 99% confidence interval for the average waiting time for all of the pa..
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