# HW12 - S tat 4714 Fall 2010 Homework 12 Due T uesday...

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Stat 4714 Fall 2010 Homework 12 – Due Tuesday November 30 at 6:15pm Chapter 9, 12 and Material on Bayesian Estimation (1) A researcher thinks the proportion of successes in an experiment is 35%. If you are trying to find a 99% confidence interval with an error within 0.5, how many subjects will be needed? (2) Compute a 98% confidence interval for the proportion of defective items in a process when it is found that a sample of 100 yields 8 defective items. (3) A new radar device is being considered for a certain defense missile system. The system is checked by experimenting with actual aircraft in which a kill or a no kill is simulated. In 300 trials, 250 kills occur. Test to see if the new system exceeds .8. (4) In a random sample of 500 college students at VT, it was found that 385 disliked statistics. A sample of 400 students at UVA found that 167 liked statistics. Test if there is a difference between the proportions of students who like statistics.

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