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Cars pass a certain street location according to a Poisson process with rate λ. A woman who want to cross the street at that location waits until she can see that no cars will come by in the next T time units.
a) Find the probability that her waiting time is zero
b) Find her expected waiting time
In a sample of 50 members of a local health club you find that 12 of these members meet weekly with a physical fitness trainer and that the average body mass index (BMI) of these 12 members is less than the average BMI of the other 38 club members..
Find the area under the normal distribution curve to the right of z = -1.03.
What is a 90% confidence interval for the mean monthly expenditure on gasoline per household in Slippery Rock?
The city council of Pine Bluffs is considering increasing the number of police in an effort to reduce crime. Before making a final decision,
At α = 0.10, can the researcher conclude that alcohol consumption is related to sex? What kind of Chi-Square test is this?
David Gallano, a wine merchant, has collected opinions on grape wine quality from a sample of his customers. These customers tasted wine made from grapes grown in three regions of the country.
Determine percent of the garages take between 29 hours and 34 hours to erect? Determine percent of garages take 28.7 hours or less to erect?
Describe a study you might design that could use the Chi Square statistic. What are the variables? What are the null and alternative hypotheses? Why would the Chi Square test be appropriate for this design?
Suppose that it is important to demonstrate that the wall thickness exceeds 4.0 mm. Test appropriate hypotheses using these data. Draw conclusions at α= 0.05.
How might variance and standard deviation be applied to a real-world business-related problem? Provide a specific application in which these measures are useful.
Suppose there are two samples of size 6 and 7, with a rank sum of 58 in the sample of size 6. Using the Wilcoxon rank-sum test, evaluate the significance of the results, assuming there are no ties.
Describe how multiple correlation and/or regression analysis is (or could be) applied in your work or life environments. Define the dependent and independent variables.
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