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Question: According to a study several years ago, the average BMW driver earns $82 600 per year. Suppose a researcher believes that the average annual earnings of a BMW driver are lower now, and he sets up a study in an attempt to prove his theory. He randomly samples 18 BMW drivers and finds out that the average annual salary for this sample is $78 974, with a population standard deviation of $7810. Use α = .01 to test the researcher's theory. Assume annual salaries are normally distributed.
Does this sample indicate a smaller average? Use α = 0.05 and assume a normally distributed population.
When the underlying average of a time series is very stable and there is no trend, cyclical, or seasonal influences,
Compute the median number of dependents?
Let et~ WN(0,2). State for each of the following model whether it is stationary and whether it is invertible. Explain your answer. a) Zt= 1+ 0.5Zt-1 + et, t=1,2.3.... b) Zt= et - 1.5et-1 + 0.5et-2, t=1,2,3,
A biologist with the Department of Agriculture is studying the growth of artichokes. She knows that the number of artichokes produced by each plant follows a distribution which is approximately normal.
Use a decision tree to recommend a decision. What is the expected value of the market research information? What is the efficiency of the information?
Where is the flaw and how can it be fixed? If R^2 is taken as a model for the Euclidean plane, does this help resolve the difficulty? Explain.
Iindependently of one another. Two hundred seeds of such a cross are raised, and 142 turn out to be blue-flowering. Are the data consistent with the model?
Pick a random sample of 50 homes from the enclosed 90 cases. Double the asking price and selling price and use this data to develop three predictive models:
A study shows that employees that begin their work day at 9:00 a.m. vary their times of arrival uniformly from 8:40 a.m. to 9:30 a.m. The probability that a randomly chosen employee reports to work between 9:00 and 9:10 is?
given the amount of vitamin c in a medium orange is normally distributed with a mean of 70mg and a standard deviation
Southeastern Bell stocks a certain switch box at its central warehouse for supplying field service offices. The yearly demand for these connectors is 15,000 units.
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