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Media survey
In 2007, a Gallup Poll conducted face- to-face interviews with 1006 adults in Saudi Arabia, aged 15 and older, asking them questions about how they get in- formation. Among them was the question: "Is international television very important in keeping you well-informed about events in your country?" Gallup reported that 82% answered "yes" and noted that at 95% confidence there was a 3% margin of error and that "in addition to sampling error, question wording and practical difficulties in con- ducting surveys can introduce error or bias into the find- ings of public opinion polls."
a) What kinds of bias might they be referring to?
b) Do you agree with their margin of error? Explain.
prices for regular unleaded gasoline can vary widely from day to day and location to location. these data were obtained
A regional manager visits local fast-food franchises and evaluates the speed of the service. If the manager receives her meal within 45 seconds, the server is given a free movie-admission coupon.
With a mean of $8.90 and a standard deviation of $5.70. She waites on 30 parties. What is the probability that she will earn at least $350?
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Find the critical value, t0, to test the claim that the mean1>mean 2. Two samples are randomly selected and come from populations that are normal. The sample statistics are given below. Assume that standard deviation 2/1 is not equal standard devi..
the human relations director at dupont began a study of the overtime hours in the inspection department. a sample of 16
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