ALC EXAM 9 QUESTIONS & ANSWERS LATEST UPDATE

c. A descriptive statistic d. A sample statistic 3. The process of using sample statistics to draw conclusions about population parameters is called . a. finding the significance level b. calculating descriptive statistics c. doing inferential statistics d. calculating the confidence level 4. Which of the following statements involve descriptive statistics as opposed to inferential statistics? a. The Alcohol, Tobacco and Firearms Department reported that Houston had 1,791 registered gun dealers in 1997. b. Based on a survey of 400 magazine readers, the magazine reports that 45% of its readers prefer double column articles. c. The FAA samples 500 traffic controllers in order to estimate the percent retiring due to job stress related illness. d. Based on a sample of 300 professional tennis players, a tennis magazine reported that 25% of the parents of all professional tennis players did not play tennis. 5. A population of all college applicants exists who have taken the SAT exam in the United States in the last year. A parameter of the population are . a. students who completed the SAT exam b. college applicants c. U.S. college applicants in the last year d. SAT scores 6. Which of the following statements is true regarding the design of a good survey? a. The questions should be made as long as possible b. A mixture of dichotomous, multiple-choice, and open-ended questions may not be used c. Leading questions must be used d. The questions should be kept as short as possible 7. Which method of data collection is involved when a researcher counts and records the number of students wearing backpacks on campus on a given day? a. An experiment b. A survey c. Direct observation d. Interview 8. The manager of the customer service division of a major consumer electronics company is interested in determining whether the customers who have purchased a videocassette recorder over the past 12 months are satisfied with their products. If there are four different brands of videocassette recorders made by the company, the best sampling strategy would be to use a . a. simple random sample b. stratified random sample c. cluster sample d. self-selected sample 9. Which of the following types of samples is almost always biased? a. Simple random samples b. Stratified random samples c. Cluster samples d. Self-selected samples 10. is an expected error based only on the observations limited to a sample taken from a population. a. sampling error b. response error c. nonresponse error d. non-sampling error 11. Bayes's Law is used to compute . a. prior probabilities b. joint probabilities c. union probabilities d. posterior probabilities 12. The classical approach describes a probability . a. in terms of the proportion of times an event is observed to occur in a very large number of trials b. in terms of the degree to which one happens to believe that an event will happen c. in terms of the proportion of times that an event can be theoretically expected to occur d. is dependent on the law of large numbers 13. If a set of events includes all the possible outcomes of an experiment, these events are considered to be . a. mutually exclusive b. exhaustive c. intersecting d. inclusive 14. Which of the following statements is not correct? a. Two events A and B are mutually exclusive if event A occurs and event B cannot occur. b. If events A and B occur at the same time, then A and B intersect. c. If event A does not occur, then its complement A' will also not occur. d. A union of events occurs when at least one event in a group occurs, e.g., (A or B or C). 15. The can determine the union of two events such as event A and event B. a. multiplication rule b. Bayes' Law Formula c. complement rule d. addition rule 16. The concept that allows us to draw conclusions about the population based strictly on sample data without having any knowledge about the distribution of the underlying population is . a. the central limit theorem b. standard error of the mean c. the range d. the standard deviation 17. Each of the following are characteristics of the sampling distribution of the mean except . a. the sampling distribution of the mean has a different mean from the original population b. the standard deviation of the sampling distribution of the mean is referred to as the standard deviation c. if the original population is not normally distributed, the sampling distribution of the mean will be normal d. if the original population is not normally distributed, the sampling distribution of the mean will also be approximately normal for large sample sizes 18. Suppose you are given 3 numbers that relate to the number of people in a university student sample. The three numbers are 10, 20, and 30. If the standard deviation is 10, the standard error equals . a. 5.77 b. 14.227 c. 8.165 d. 1.732