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According to police sources a car with a certain protection system will be recovered 88% of the time. Find the probability that 4 of 9 stolen cars will be recovered.
What is the importance of pretesting questions and instruments? What are risks of not doing this? Provide an example.
Calculate the mean difference for the following data. The scores are the number of pictures the participants remembered correctly out of 20.
Tthe true population mean when different samples of the same size are taken. Note that the variability of the sample mean is LESS than that of individual observations Does this makes sense?
A nursing school wants to estimate the true mean annual income of its alumni. It randomly samples 120 of its alumni. The mean annual income was $58,700 with a standard deviation of $1,500.
Your company has experienced problems with employee morale and productivity. The consultant that was hired submits a report that includes opinions and data collected from 300 secretaries and clerks as well as 75 senior managers.
An aquarium tank can hold 7700 liters of water. There are two pipes that can be used to fill the tank. The first pipe alone can fill the tank in 77 minutes.
But each such incident costs $50. What is the probability that maintenance expenses for the press will be no more than $100 on a typical 8 hour workday?
On any given day, about 45% of the stocks on the American Stock Exchange increase in value. A random sample of four independent stocks is chosen.
A math course has 2 sections. Section one has 55 students of which 10 received an A. Section two has 45 students of which 11 received an A. If a student was chosen randomly from 100 students
Salaries upon graduating than are graduates of other programs. Describe a statistical experiment that could help test your belief.
A real estate investor has two houses: A and B. Each house may increase in value, decrease in value, or remain unchanged. Consider the experiment of investing in the two houses and observing the change (if any) in value:
The corporation there's a pretty good chance the average number of days absent would be 12 or more. that's what happened to us chance variation. Is this a good defense? Justify your answer.
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