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Plot the market-share data. (b) Describe the trend (if any) and discuss possible causes. (c) Fit three trends (linear, exponential, quadratic). (d) Which trend model is best, and why? If none is satisfactory, explain. (e) Make a forecast for 2004 by using a trend model of your choice or a judgment forecast Asian and European Share of U.S. Light Truck Sales, 1990-2003
Year Percent Year Percent1990 16.4 1997 15.41991 17.1 1998 16.21992 14.3 1999 18.41993 13.7 2000 21.21994 14.2 2001 23.11995 13.6 2002 23.91996 13.6 2003 26.6
How large should n be so that the standard deviation of is no more than 0.01 and sampling distribution
A sample of 40 ovservations is selected from one population. The sample mean is 102 and the sample standard deviation is 5. A sample of 50 observers is selected from a second population.
In a sample of 55 mice, a biologist found that 42% were able to run a maze in 30 second or less. Find the 90% limit for the population proportion of mice who can run a maze in 30 second or less.
Suppose that a certain college class contains 54 students. Of these, 34 are sophomores, 35 are psychology majors, and 7 are neither. A student is selected at random from the class.
The personnel manager at a company wants to investigate job satisfaction among the female employees. One evening after a meeting, she talks to all 30 female employees who attended the meeting.
Under what circumstances should a nonparametric test be used? Explain. What are the strengths and weaknesses of nonparametric tests? Can the outcomes of nonparametric tests be generalized to populations?
Then test to see whether it considerably varies from 0 [use alpha = 5%]. Don't forget to identify the null and alternative hypotheses.
Compute the mean and standard deviation of the scores and use these for the calculations below. Show your calculations on the back of his page.
Develop a mathematical programming model and solve. Discuss your results [total profits, total costs, etc].
A survey of undergraduate students in the School of Business at Northern University revealed the following regarding the gender and majors of the students:
Number of miles flown in a One- year period by the sample of "frequent flyers" was recorded. Is this a grouped or an ungrouped frequency distribution?
A normal population has a mean of 75 and a standard deviation of 5. You select a sample of 40. Compute the probability the sample mean is:
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