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A population of 600 voters contains 252 Republicans, 300 Democrats, and 48 independents and members of other parties. A simple random sample of 60 voters will be drawn from this population. The chance the sample contains only Republicans and Democrats is?
Assume we have a population of scores with mean (mu) of 200 and standard deviation (sigma) of 10. Assume that the distribution is normal. Provide answers to the following questions:
Of the drivers who stop at a gas station, 92% purchase gasoline, and 6% purchase both gasoline and oil. A total of 7% purchase oil.
Sketch the distributions involved, and (c) explain your answers to someone who has never had a course in statistics.
Tavern has budget of $2,000 for beer for Super Bowl Sunday. Betty desires to find out number of gallons of each brand of beer to order so as to maximize profit. Create a linear programming model for this problem.
You sample a group of computers and use the sample statistics to calculate a 95% confidence interval of (-10.95, -1.5). This interval estimates the difference of (average boot time (HDD) - average boot time (SSD)). What can we conclude from this i..
Find the product of the vector of state probabilities for the preceding period and the matrix of transition probabilities.
Twelve cases of leukemia are reported in people living in a particular census tract over a 5-year period. Is this number of cases abnormal if only 6.7 cases would be expected based on national cancer-incidence rates?
The engineers hoped to base their decision on the reactions of 50 drivers, but time and budget constraints may force them to cut back to 20. How would this affect the power of the test? Explain.
Construct appropriate control charts for before and after introduction of the new pathway. Discuss process stability and the results.
For sample of size 100, what is the mean and standard deviation of the sample mean.
You create a 95% confidence interval for your average score and it is (76.347, 79.133). Given this information, what is the best conclusion?
How many students should be surveyed to estimate the mean score within 25 points with 90% confidence?
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