Find the standard deviation
The average age of Amtrak passenger train cars is 19.4 years. If the distribution of ages is normal and 24% of the cars are olderthan 21.1 years, find the standard deviation.
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A company has 1,250 employees, and you want to take a simple random sample of n = 60 employees. Explain how you would go about selecting this sample by using the table of random numbers. Are there numbers that you cannot use? Explain.
A toll bridge charges $1.00 for passenger cars and $2.50 for other vehicles. Suppose that during daytime hours, 60% of all vehicles are passenger cars. If 1000 vehicles cross the bridge that afternoon, what is the expected toll revenue?
For the following, decide whether the Binomial or Hypergeometric distribution is the most appropriate model. Give a brief description of your reasoning.
A homogenous transition probability matrix is given below. Find the steady state probabilities of state.
Assuming this to be a simple random sample of U.S. adults, construct and interpret the 95% and 99% confidence intervals for the proportion of U.S. adults who consider lounging at the beach to be their dream vacation.
A division within a transportation company is responsible for performing maintenance on the fleet of trucks used by the company. Trucks in need of repair arrive to the maintenance division according to a Poisson process having a rate of 0.3 trucks
Suppose we obtained data on vein size after application of a nitroglycerin ointment in a sample of 50 patients. The mean vein size is found to be 7.8mm with an SD of 2.1.
In the past the standard deviation of weights of certain 32.0-oz packages filled by a machine was 0.25 oz. A random sample of 20 packages showed a standard deviation of 0.35 oz. Is the apparent increase in variability significant at the 0.10 level
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