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Traffic engineers are studying a long tunnel in colorado. if x represents the time for a vehicle to go through the tunnel, it is known that x is normally distributed with mean 12.1 minutes and standard deviation 3.8 minutes, under ordinary traffic conditions. what is the probability that a single car chosen at random will travel through the tunnel in 10 minutes?
Two events are mutually exclusive: If their intersection is 1, If they have no sample points in common.
Why are quasi-experimental designs used more often than experimental designs?
Think of your favorite casino game (craps, black-jack, roulette, etc) and analyze the probabilities of a few different outcomes.
A civil service exam is given to 200 job applicants. In recent years, grades have followed a normal distribution with mean 66.5 and variance 100. The grades of the job applicants are distributed as follows:
What is the 99% confidence interval for the true proportion of all e-mail subscribers that opened the e-mail within 24 hours of receiving it?
In each of the following cases, decide whether or not a binomial distribution is an appropriate model, and give your reasons.
The New York Times reported (L.J> Flynn, Tax Surfing, The New York Times, March 25, 2002, p. C10) that the mean time to download the home page for the internal Revenue Service (IRS) , was 0.8 second. Suppose that the download time was normally di..
Which of given is the correct decision statement for test?
What is the probability of getting a perfect score if you were forced to guess at each question?
Pages a user can expect from a print cartridge. A sample of 10 cartridges revealed the following number of pages printed. What is the point estimated of the population mean?
One of 4 bus drivers is also arbitarily selected. Let Y denote number of students on his bus. Caculate expectations of X and Y: E(X)=?
Use 9 classes. Is the histogram approximately bell shaped and symmetic? Does this agree with the results predicted by the Central Limite Theorem?
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