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Suppose that in the long run thirty percent of all vehicles passing through a tollbooth are 4WDs. If a random sample of 120 vehicles passing through the tollbooth is taken, what is the probability that the sample proportion containing 4WDs is between .25 and .33?
State the null and alternate hypotheses, the decision rule, find the test statistic, state your decision, and estimate the P value for the following:
The following are characteristics of the scientific method except for: (a) the definition of the problem in specific terms
A random sample of 300 beer drinkers is selected and each member of the sample is asked to choose between two brands of beers: Brand A and Brand B. The results are that 165 prefer Brand A and 135 prefer Brand B.
in a study of 23 criminals convicted of antitrust offenses the average age was 55 years with a standard deviation of
These are the winning percentages for 11 baseball players for each one's best 4-year pitching performance: Compare the mean and median. Does the differencebetween them suggest that the data are skewed very much
Construct a time series plot. What type of pattern exists in the data? Compute the exponential smoothing forecasts for a = .2.
Use the population mean and standard deviation to find the z-score corresponding to 14.5%, the rate offered by the Bar Harbor Bank and Trust Company. Is this above or below the average?
Unfortunately, any cases not sold by the end of the month are of no value, due to spoilage. How many cases of cheese should Jason manufacture each month?
The old equipment? based on the results, does the new equipment appears to be effective in reducing the variation of the weights?
the following data show the daily closing prices in dollars per share for a stock. period price 1 82.87 2 83.00 3
in an emergency the typical driver requires about 0.75 seconds to get his or her foot onto the brake. the distance that
What is the probability that a single, randomly selected piece of material will be defective? (Give the answer to two decimal places.)
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