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A description of a poll in a certain newspaper says that one can be 95% confident that error due to sampling will be no more than plus or minus 3 percentage points. A poll in the New York Times taken in Iowa says that "according to statistical theory, in 19 out of 20 cases the results based on such samples will differ by no more than 3 percentage points in either direction from what would have been obtained by interviewing all adult Iowans." These are both attempts to explain the concept of confidence intervals. Do both statements say the same thing? If not, which do you think is the more accurate description?
Your client is being sued. You have asked the client's lawyer about the possibility of losing the lawsuit. The client, meanwhile, has asked you to describe what would happen to his or her financial statements.
The standard deviation of the differences d for the paired sample data s d = ____________
at parkview at any given time the probability that a randomly selected student is a female is 30. with this binomial
BMI is measured in a sample of patients, with a mean of 31.7 and a standard deviation of 5.9. How many subjects would be needed to ensure that a 95% confidence interval estimate of BMI had a margin of error not exceeding 2 units?
A steel pipe fittings company claims that the yield strength of its nontempered couplings is more variable than that of its tempered couplings. A random sample of nine tempered couplings has a standard deviation of 13.1 megapascals
a random sample of 12 employees in a large manufacturing plant found the following figures for number of hours of
suppose the equation of the regression line for the debt per capita for the years 1990-2001 is computed to be debt per
Estimate the mean monthly rent paid by the whole student population. what is the probability that the sample mean exceeds the population mean by more than %5.
What probability distribution does n1 alone have? Specify the values of the sample size index and parameter for that distribution
Create trend-moving averages with the following values form: 10, 100, and 200. Graph the data with Excel.
A film alliance used a random sample of 50 U.S. citizens to estimate that the typical American spent 78 hours watching videos and DVDs last year. The standard deviation of this sample was 9 hours.
There is sufficient evidence to support the claim that the mean speed of all cars on that section of I-10 is greater than the posted speed limit of 70 mph.
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