2014-Quiz 2 Solutions - Statistical Analysis Quiz 2 Section 510.601.52-1 An internet provider tells customers that its staff will arrive any time

2014-Quiz 2 Solutions - Statistical Analysis Quiz 2 Section...

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Statistical Analysis Quiz 2 Section : 510.601.52-1 An internet provider tells customers that it’s staff will arrive any time between 9am and 11am to install high speed internet at their home, the probability of arrival is equal for all times in this window of 2 hours. a. Is the time of arrival a discrete or continuous random variable? What is the likely distribution of the random variable? (2 points) Continuous Uniform b. What is the mean time of arrival? (3 points) μ x = 11 9 2 = 1 c. What is the probability that a randomly selected visit falls between 10am and 11am? (3 points) p ( 10 ≤ x≤ 11 ) = 11 10 11 9 = 0.5 d. If you take all possible samples of this 2 hour window, what is the distribution of the means of the samples? (1 point) Normal 2. On a recent survey of 1600 US adults, it was found that 40% disapprove of President Obama. Provide a95% confidence interval for this proportion and interpret the meaning of this confidence interval. (4 points) σ ^ p = 0.4 ± 1.96 0.4 0.6 1600
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2. On a recent survey of 1500 US adults, it was found that 30% disapprove of President Obama. Provide a95% confidence interval for this proportion and interpret the meaning of this confidence interval. (4 points) σ ^ p = 0.3 ± 1.96 0.3 0.7 1500
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