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A local television station sells 15-second, 30-second, and 60-second advertising spots. Let x denote the length of a randomly selected commercial appearing on this station, and suppose that the probability distribu- tion of x is given by the following table:
x 15 30 60
p(x) .1 .3 .6
a. Find the average length for commercials appearing on this station.
b. If a 15-second spot sells for $500, a 30-second spot for $800, and a 60-second spot for $1000, find the average amount paid for commercials appearing on this station. (Hint: Consider a new variable, y = cost, and then find the probability distribution and mean value of y.)
Milligrams with standard devation s=1.0 milligram. construct a 95% confidence interval for the difference between the mean nicotine content of two brands of cigarettes.
What does 95% confidence interval mean? What would it be for the study described in Question 3? Why do we compute it? (See pp. 361-362. This is also discussed in previous chapters).
using all four demographic reports overview trend employment and population detail for zip code 60614 choose four
The standard screening test for Down's Syndrome is based on combination of maternal age and the level of serum alpha-fetoprotein. Using this test 80% of Down's syndrome cases can be identified, while 5 % of normals are detected as positive.
a sample of 100 flights for united airlines shows that 64 are on time. a sample of 100 flights for american shows that
the wind mountain archaeological site is located in soutwestern new mexico. wind mountain was home to a culture of
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the alkalinity level of water specimens collected from the han river in seoul korea has a mean of 50 milligrams per
3 cards are randomly selected without replacement from an ordinary deck of 52 playing cards. Compute the conditional probability that the first card selected is a spade, given that the second and third cards are spades.
Using a level of significance of .05, is there evidence that the dual degree students are receiving lower grades? Explain.
Among 500 freshmen pursuing a business degree at a university, 347 are enrolled in an economics course, 247 are enrolled in a mathematics course, and 120 are enrolled in both an economics and a mathematics course. What is the probability that a..
At a = 0.05, what is the test value?
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