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A researcher claims that the standard deviation of the number of deaths annually from tornadoes in the U.S.A. is less than 30. If a sample of 9 randomly selected years had a standard deviation of 29, is the claim believable? Use = .01?
How large a sample is needed to find the population mean within $250 at 99 percent confidence?
Please explain by using the traditional methods for testing hypotheses and showing the results of all steps in the process.
A random sample of 400 college students was selected and 120 of them had at least one motor vehicle accident in the previous two years.
Add line-of-best fit (trend line/linear regression line) to your scatterplot. Write down the equation of the trend line below.
Interpret this data using regression and interpret all the findings, R 2 , F, IV coefficient, and the intercept.
In rectangular coordinate system, determine the distance between the points (-4,1) and (8,6).
A recent study indicated that 29% of the 100 women over age 55 in the study were widows. If no estimate of the sample proportion is available how large should the sample be?
Find out the probability of an event relies on past history of record data. The relative frequency method of computing the probability of an event relies on past history.
Based on a simple random sample of one hundred an analyst estimates the average hourly wage earned by workers in a city to be $30 and computes the margin of error to be $5.
The probability that a randomly selected elementary or secondary school teacher from a city is female is 0.68, holds a second job is 0.38, and is female and holds a second job is 0.29.
What is the purpose for post tests? To determine how much difference exists between the treatments.
A business journal investigation of the performance and timing of corporate acquisitions discovered that in a random sample of 2,863 firms, 848 announced one or more acquisitions during the year 2000.
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