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1) Jet Blue Airlines examined the bags of 80 passengers and found that 20% of the bags were overweight.
a) Based on this sample, what is the 95% confidence interval for the proportion of bags that are overweight?
b) What is the minimum sample size the airline would need to estimate with 95% confidence to obtain a margin of error of +/- 3% for this estimate of the percentage of overweight bags?
The useful life (in hours) of a certain kind of integrated circuit is a random variable having the probability density
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Travelers arrive at a bus station from 6 a.m., according to a Poisson process with rate λ = 1 per minute. The first bus leaves T minutes after 6 a.m.
According to a Harris Interactive (July 2013) poll of U.S. adults, 61% of U.S. adults work during their summer vacation.
A. One can be 95% confident that the interval 17.9months to 49.5months contains the mean duration of imprisonment,muμ,of the prisoners. B. One can be 95% confident that the minimum error made in estimating muμby x overbarxis as found in part(a). C...
Overall, the students' class attendance days (per year academic) is normally distributed around 180 days with a standard deviation of 15 days. What's the probability that the mean number of attendance days will be between 190 and 200?
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The x and the y variable in the table below are correlated. Determine the 'R' value, and then determine the regression equation.
A researcher predicts that watching a film on institutionalization will change students' attitudes about chronically mentally ill patients.
Based on given exercise and the previous two, which of the three ways of thinking is most effective for communicating the results? Give reasons for your answer.
Why you have chosen to investigate these two independent variables? How do you think they will affect your dependent variable?
How large a sample is needed to estimate the true proportion of home owners who have vegetable gardens to within 0.04 with 98% confidence?
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