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The national speed limit in the United States was reduced to 55 mph in 1974. Proponents and critics of this legislation have looked at the number of traffic fatalities on major U.S. highways (e.g., I-90, I-65, I-75) for the years preceding and following this legislation. Sonny examined the traffic fatalities on each of the major U.S. highways for every year from 1968 to 2005. Sonny used a:
Explain how many cars would required to go by the speed trap to be 99.8% sure which at least one driver will warm oncoming traffic of the speed trap.
The random variable X, representing the number of accidents in a certain intersection in a week, has the following probability distribution
You are picking up apples from a tree in a park. You are interested in estimating the mean weight of all apples in the park. Unfortunately you have only been able to find seven apples so far. Can you use the Central Limit Theorem to aid in your es..
Explain the distribution of mean of samples of size 15.
No estimate of the population proportion is available. How large a sample is required?
Write out the multiple regression equation using the given data.
If the observed value is 4, the expected value is 5, and the standard error is 4, then the test value used for the z test is equal to
Compare your best difference to the result from an ordinary two-sample t-test between these groups. Comment the difference.
If two independent large samples are taken from two populations, the sampling distribution of the difference between the two sample means:
Describe and analyze your quantitative data and Briefly address the data analysis process.
The sample mean of the number of spots on the 6000 rolls, should be about If this die is rolled 6000 times, the number of times we get a 2 or a 3 should be about
Make a forecast for 2004, using either the fitted trend model or a judgment forecast. Why is it best to ignore earlier years in this data set?
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