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A population is estimated to have a standard deviation of 13. We want to estimate the population mean within 3, with a 99 percent level of confidence.
How large a sample is required?
A rocket fires two engines simultaneously. One produces a thrust of 800N directly forward while the other gives a thrust of 508N at an angle 38.2^circ above the forward direction.
What does analysis of variance mean? One of the students answers this question as follows:
the national average sat score for verbal and math is 1028. if we assume a normal distribution with o92 what is the
The diameters of oranges in a certain orchard are normally distributed with a mean of 5.26 inches and a standard deviation of 0.50 inches.
You are asked to estimate the chance that the sum will be positive.
How large a sample should be selected in order to estimate the population proportion to within a margin of error of 0.02 with 97% confidence. The sample proportion from the preliminary sample was 0.18.
If you perform step 3 correctly you will get a negative value. These are absolute valued tests so Ignore the - sign. These problems depend on the same normal curve
Does the 99% confidence interval contain the actual population mean? If not, explain why not. What proportion of many similarly constructed confidence intervals should include the true population mean value?
a police commissioner is interested in the number of phone calls into the police dispatcher that result in criminal
Based on the data, determine the 95 percent confidence interval evaluate for true population mean?
Under older Federal Aviation Administration rules, airlines had to estimate the weight of a passenger as 185 pounds. That amount is for an adult traveling in winter, and it includes 20 pounds of carry-on baggage.
Define probability and explain the three perspectives. Provide an example of each. Describe the difference between subjective and probabilistic sampling methods. What are the advantages and disadvantages of each?
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