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PracticeFinal_soln - Econ 2500 Practice Final Solutions...

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Econ 2500 - Practice Final Solutions 1. (30 points) Multiple choice questions 1) A 95% confidence interval for the mean of a population is computed from a random sample and found to be 9 3 . We may conclude that A) There is a 95% probability that is between 6 and 12. B) There is a 95% probability that the true mean is 9 and there is a 95% chance that the true margin of error is 3. C) If we took many, many additional random samples and from each computed a 95% confidence interval for , approximately 95% of these intervals would contain . D) All of above. Answer C 2) Suppose that the population of the scores of all high school seniors that took the SAT-M (SAT math) test this year follows a normal distribution with mean and standard deviation 100 . You read a report that says, “On the basis of a simple random sample of 100 high school seniors that took the SAT-M test this year, a confidence interval for is 512 25.76 .” The confidence level for this interval is 3) Other things being equal, the margin of error of a confidence interval increases as 4) The P-value of a test of a null hypothesis is
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