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IRS
In a random survey of 226 self-employed individuals, 20 reported having had their tax returns audited by the IRS in the past year. Estimate the proportion of self- employed individuals nationwide who've been audited by the IRS in the past year.
a) Check the assumptions and conditions (to the extent you can) for constructing a confidence interval.
b) Construct a 95% confidence interval.
c) Interpret your interval.
d) Explain what "95% confidence" means in this context.
In summer 2000, a growing number of warranty claims on Firestone tires sold on Ford SUVs prompted Firestone and Ford to issue a major recall. An analysis of warranty-claims data helped identify which models to recall.
Determine the probability that person selected has blood type O? Given that person selected is a male, determine the probability that their blood type is AB?
two years of rainfall acidity data was analyzed at 9 monitoring stations in the eastern united states. for each of two
the cost of a college education has increased at a much faster rate than costs in general over the past twenty years.
Search the Internet to find three applications of statistical concepts that you find interesting, that you encounter on a daily basis, or that you find in your profession.
A travel agent suggests that since the law of averages makes it highly unlikely to have two plane crashes within a few weeks of each other, flying soon after a crash is the safest time. What do you think?
the one-sample t statistic from a sample of n25 observations for the two-sided test ofh0 u 64ha u ? 64has the value t
the coca-cola company reported that the mean per capita annual sales of its beverages in the united states was 423
There are 30 customers on a given day. What is the salesperson’s expected gross pay and the standard deviation of the salesperson’s gross pay for that day?
A market researcher is interested in knowing the type of training that works best for DVD users. Thirty consumers are randomly selected from a population of known DVD owners (i.e., users).
a university dean wishes to estimate the average number of hours that freshmen study each week. the standard deviation
find the mean and standard error of the sample means that is normally distributed with a mean of 10 and a standard
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