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Unformatted text preview: PADP 6950 Spring 2011 Fertig UGA Practice Problems for the Midterm 1. Explain the difference between sampling error and sampling bias. 2. To measure the center, why is the median sometimes preferred over the mean? Why is the mean sometimes preferred over the median? In each case, give an example with actual numbers to illustrate your answer. 3. What is the difference between the standard deviation and the standard error? Explain using equations and words. 4. You plan to sample from the 30,000 students at UGA to compare the proportions of white students and black students who believe that the legal age for alcohol should be changed to 18. Explain how you would proceed if 3. What is the difference between the standard deviation and the standard error? Explain using equations and words. 4. You plan to sample from the 30,000 students at UGA to compare the proportions of white students and black students who believe that the legal age for alcohol should be changed to 18. Explain how you would proceed if you want a systematic random sample of 100 students. 5. On a midterm exam in statistics, an instructor always gives a grade of B to students who score between 80 and 90. One year, the scores have approximately a normal distribution with mean 83 and standard deviation 5. About what proportion of the students get a B?...
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 Summer '11
 FERTIG

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