Probability that a randomly selected hybrid vehicle
The true highway mileage, Y, of a specific brand of hybrid vehicle has a normal distribution with a mean of 42 and a standard deviation of 1.5. Find the probability that a randomly selected hybrid vehicle gets more than 38 miles to the gallon.
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A recent survey asked American adults how often they volunteered for charity. In the sample of 1,974 people, 51 said "more than once per week.
One manufacturer of aspirin claims that the proportion of headache sufferers who experience relief by taking only two pills is 0.53. If this claim is true,
Find the probability that the sample mean would be less than 40, to three decimal places. [Hint: Use the correct z-score calculation.
What would the standard deviation of the sampling distribution of the sample proportion be in this case?
Give the lower bound of the 95% confidence interval for the true proportion of all CEOs who have MBAs. Take all calculations to three decimal places.
What is the probability of obtaining a sample average this low if the process is set up as described above? Take your answer to three decimal places. [Hint: This is a sampling distribution problem. Be sure to use the correct z-score calculation.]
Assuming that the uninsured rate is the same today as it was in 2002, determine the probability distribution for the number, X, who have no health insurance coverage.
If 500 people are randomly selected from the American population, what is the probability of obtaining a sample proportion of 9% or less?
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