fall07reviewsession2

# fall07reviewsession2 - POLS 203 FALL 2006 PRACTICE PROBLEMS...

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POLS 203 FALL 2006 PRACTICE PROBLEMS 2 Please note that in the exam you will be asked to show all the steps in answering the question and at the end, interpret the results in a couple of sentences. 1. A random sample of n=25 from a normally distributed population with σ=7 yields a sample mean x=67.3. What is the 99% confidence interval for μ? (63.688 to 70.912) 2. We want to test the hypothesis that the mean of a population is μ=46. We draw a sample size of n = 100 and obtain a sample mean x=51. We also have the information, population variance=400.Compute the relevant test to test this hypothesis, showing all the necessary steps. At which level of significance are you able to reject H 0 ? (z=2.5, reject at .05 level, fail to reject at .01 level) 3. An auditor wants to test a company's claim that average accounts receivable could equal the \$375 stated on the balance sheet. The population standard deviation is \$100.00. A sample mean from 49 accounts was \$400.00. (α=.05 significance level). (t=1.75, fail to reject Ho)

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fall07reviewsession2 - POLS 203 FALL 2006 PRACTICE PROBLEMS...

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