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Underage drinking, Part II. We learned in Exercise 3.25 that about 70% of 18-20 year olds consumed alcoholic beverages in 2008. We now consider a random sample of fifty 18-20 year olds.
(a) How many people would you expect to have consumed alcoholic beverages? And with what standard deviation?
(b) Would you be surprised if there were 45 or more people who have consumed alcoholic beverages? (c) What is the probability that 45 or more people in this sample have consumed alcoholic beverages? How does this probability relate to your answer to part (b)?
the average age of vehicles registered in the united states is 96 months. assume the population is normally
Leaks occur in a pipeline at a mean rate of 4 leaks per 1,000 meters. In a 2,500-meter section of pipe, (a) Using the Poisson approximation to the binomial find the probability of no leaks? (Round your answer to 6 decimal places.)
Further suppose that the test is 98% accurate. What s the probability that a woman whose test indicates that she is pregnant actually is?
Calculate the standard normal distribution value
the number of carbohydrates in grams per 8-ounce serving of yogurt for each of a random selection of brands is listed
Serum cholesterol levels were taken from a population of 10,000 college students. The results were normally distributed. Males had a mean of 195 and a standard deviation of 10. Females had a mean of 185 and a standard deviation of 12.
In the context of hypothesis testing regarding one mean, the test (Z or t) may be statistically significant at the 5% level, but not significant in a practical sense at all. Illustrate the meaning of this statement by citing 3 examples from any ar..
In June 2009, the Gallup-Healthways Well-Being Index (well-beingindex.com) reported that 49% of Americans exercise for 30 minutes or more on 2 or fewer days.
Estimate the cdf F (x). Compute and plot a 95 percent con?dence envelope for F (as described in the appendix). Find an approximate 95 percent con?dence interval for F (4.9) - F (4.3).
In one paragraph, describe the conclusion you would reach about the participants' performance if the P-value of the hypothesis test was determined to be .065. Include the rationale for your conclusion.
Suppose that four tickets will be given prizes in a lottery having 30,000 tickets. What is the probability of winning at least one prize if you buy 1,000 tickets?
Unknown to the supervisor, three of the workers have regularly been giving illegal deductions to applicants. What is the probability that both of the two workers chosen have been giving illegal deductions?
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