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Unformatted text preview: Final Exam - Spring 2004 - ST 370 Online/Distance Darken the circle on the answer sheet corresponding to your answer. Use a number 2 pencil. Stray marks on the form may cause errors. All questions are worth 4 points. 1. Which of the following are measures of location? A. sample median B. sample mean C. sample standard deviation D. A and B E. None of the above 2. An important distinction in the second half of the course is between discrete and continuous random variables. Which one of the following types is a continuous random variable? A. Poisson B. binomial C. Weibull D. A and B E. None of the above 3. In the early lesson on hypothesis testing, the following statement was found in the summary (talking about comparing two population mean values): The p value is a useful measure of evidence against the null hypothesis. But one must be careful because a small p value can be due to either (i) a small population mean difference and large sample sizes. or (ii) a large population mean difference and small sample sizes For which of those two situations would we say we have a statistically significant result but not likely a practically significant result ? A. (i) B. (ii) 4. We are studying a population with unknown mean and standard deviation that we guess is around 2. We plan to take a random sample and want to construct a 90% confidence interval of length 3 (right endpoint- left endpoint = 3). How large should the sample size be? A. 34 B. 5 C. 16 D. 43 E. None of the above. 1 5. For confidence intervals and hypothesis tests based on Z statistics, we often have to look up special constants from the standard normal table. We use the notation z for the (1- )100th percentile, P r ( Z > z ) = . Find z . 02 ....
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This note was uploaded on 01/16/2012 for the course ST 370 taught by Professor Nail during the Spring '08 term at N.C. State.
- Spring '08