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A sales analyst wants to determine whether there is a difference in the mean monthly sales of a company's four sales regions. Several salespersons from each region are randomly selected and each provides his or her sales amounts (in thousands of dollars) for the previous month. The results are listed in the following table. At alpha = 0.05, can the analyst conclude that there is a difference in the mean monthly sales among the sales regions? Assume that each population of sales is normally distributed and that the population variances are equal.
A study was conducted to demonstrate the effectiveness of an investigational drug product in reducing the number of epileptic seizures in patients who have not been helped by standard therapy. Thirty patients participated in the study, with 15 ran..
a^2 + b^2=c^2 + d^2 where a,b,c,d are real numbers(describe equivalence cl). For a pair of fractions a/b and c/d define a/b ~ c/d if ab=cd(same here)
Each test of an integrated circuit produces an acceptable circuit with probability p, independent of the outcome of the test of any other circuit. In testing n circuits, let K denote the number of circuits rejected and let X denote the number of a..
Compare available records of the divorce rates of each Emirate based on the statistics provided by the Civil Registry or Court. Choose a sample of divorce couples , and float a questionnaire to find out the reasons why they divorced
A sample of 100 mortgages approved during the current year showed that 31 were issued to a single-earner family or individual. The historical average is 25 percent.
One thing you have learned is that the tangency portfolio will give you the maximum Sharpe ratio. Consequently, you have constructed such a portfolio. What are you portfolio weights.
A newspaper ad for a manager trainee position contained the statement "Our manager trainees have a first-year earnings average of $20,000 to $24,000." Do you think that the ad is describing a confidence interval? Explain your answer.
Which of the following is the most reliable source of information? Which of the following are the most common types of doubts people may have about a source?
dupont automotive is a major supplier of paint to the automotive industry. a survey of 100 randomly selected autos in
a client gives you a data set of 30 observed values that represent the number of gallons of gas that 30 individual
The accompanying two-way frequency table appears in the article "Marijuana Use in College" (Youth and Society, 1979: 323-334). Each of 445 college students was classified according to both frequency of marijuana use and parental use of alcohol and..
The amount of money spent by a customer is uniformly distributed over (0, 100). Find the mean and variance of the amount of money that the store takes in on a given day.
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