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AT&T was running commercials in 1990 aimed at luring back customers who had switched to one of the other long-distance phone service providers. One such commercial shows a businessman trying to reach Phoenix and mistakenly getting Fiji, where a half-naked native on a beach responds incomprehensibly in Polynesian. When asked about this advertisement, AT&T admitted that the portrayed incident did not actually take place but added that this was an enactment of something that "could happen." Suppose that one in 200 long-distance telephone calls is misdirect- ed. What is the probability that at least one in ?ve attempted telephone calls reaches the wrong number? (Assume independence of attempts.)
Write a statement that interprets the confidence interval. Based on the preceding result, should pollsters be concerned about results from surveys conducted by telephone?
Carry out an appropriate text at a 5% level of significance to test george and Jerry's theory. Interpret the p-value you calculated in part A. Construct and interpret a 92% condidence interval for P.
Box 1 has 3 chips numbered 1,2,3. Box 2 has 2 chips numbered 1 and 2. Suppose a chip is randomly selected from box 1 and placed in box 2.
Under what circumatances do you use a one-sided confidence interval instead of a 2 sided confidence interval?
let n be the set of positive integers and for each n ? nan x x is a multiple of na 5 find r such that ar a3 a5 .b 5
a person has a health saver plan with the likelihood of spending per year 1000 .10 2000 .20 30000.30 and 40000.4. with
Constructing a scatter plot and determining correlation. a. display the data in a scatter plot, b. calculate the correlation coefficient f, and c. make a conclusion about the type of correlation.
a national survey of 40000 adults in the us in 1992 found that 26 of adults were current smokers. a similar survey of
Non-response rates of 5-15 per cent are often quoted for random sample interviewer surveys, why are figures not quoted for quota surveys? Which of the five types of non-response are relevant for quota surveys?
Determine the critical path probability that project will be completed within?
We have already been introduced to sensitivity analysis via the geometry of a simple example. We saw that the values of the decision variables and those of the slack and surplus variables remain unchanged even though some coefficients in the objec..
a previous analysis of paper boxes showed that the standard deviation of their lengths is 15 millimeters. a packer
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