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Now, suppose that you can hire a consultant, for an additional $8 000 per month, to help improve your investment choices. The effect will be to increase the mean rate of investment growth from 12% to 12.5%. (The standard deviation of the monthly growth rates will remain 60%.) Is the increased investment growth worth the consulting fee?
The random variable x is the number of houses sold by a realtor in a single month at the real-estate office. Its probability distribution is:
Describe the advantages and disadvantages of quasi-experiments? What is the fundamental weakness of a quasi-experimental design? Why is it a weakness? Does its weakness always matter?
Use these statistics to construct a 94% confidence interval for the mean monthly consumption for the population of all Ontario households.
Which gives an expected value of: (0.10)($100) + (0.90)($10) = $19.00. Compute the expected value for the "Reject Christ" decision and pick the "best" choice to make.
Define null and alternative hypothesis and, using sample info. Test manufacturer's claim at 0.01 (1%) level of significance.
For a new HDTV the mean number of months until repairs are needed is 36.84 with a standard deviation of 3.34 months.
True mean number of years to retirement of its employees to within one month of the true mean and with 90% confidence if the range of the data is 7 years?
If the supermarket begins each morning with a stock of 61 cartons of eggs, approximately what percentage of days will there be a surplus of eggs?
Discuss the strengths and weaknesses of correlational and regression studies; discuss concepts such as positive and negative correlations, correlation coefficients, confounding, and causality.
According to the National Football League, the average salary for players for the 2010 season was about $1.9 million while the median salary is around $770,000. Why are both numbers reported? What might the difference between the two statistics me..
An experimental drug is administered to 30 randomly selected indivduals, with the number of individuals responding favorably recorded. Does this represent a binomial experiment.
During the past year, the mean sales of Wshington Reds in cases was 45,000 cases, and the standard deviaiton was 4,450. How many cases of Washington Reds should be brought to market? Assume the sales follow a normal distribution.
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