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Knowledge { 24 marks} Multiple Choice Identify the choice that best completes the statement or answers the question. Which method is most likely to produce a random sample of six members in your class? a. Listing the first six students you can think of b. Writing the name of each person in the class on a piece of paper and drawing 6 names from a hat c. Selecting the first six students who arrive to class d. Choosing the 6 youngest students in the class 2 . A large corporation wants to find out which benefits plan its employees would prefer. Which procedure would be most likely to obtain a statistically unbiased sample? a. surveying a random sample of employees from a list of all employees b. inviting all employees to indicate their choices by e-mail placing suggestion boxes at random locations in the company's plant and offices d. assembling a group with one member from each department and recording the preferences of these employees 3. A college president wants to find out which courses students consider to be of the most benefit to them. Which procedure would be most likely to produce a statistically unbiased sample? a. asking students to mail in a questionnaire b. surveying a random sample of students taken from the list of all students C. surveying the first hundred students on an alphabetical list d. having students complete a questionnaire on the college web site 4. Which question is unbiased? a. Does the school board have the right to enforce a dress code? b. Do you think the mayor is doing a good job in spite of his questionable character? c. Do you prefer daytime or evening television programming? d. Do you think the government should be allowed to cut down trees willy-nilly to build a new highway? Which question is biased? a. Are you happy with your present cell provider service? b. Should the school repave the parking lot? C. Is the current minimum age requirement for drivers appropriate? d. Do you prefer bringing a healthy lunch to school or eating cafeteria food? 6. The number of building permits a town issued each day during a two-week period are listed below. What are the mean, median, and mode for this set of data? 9, 13, 20, 19, 29, 13, 13, 13, 16,25 a. mean 13, median 14.5, mode 17 C. mean 19, median 17, mode 13 b. mean 14.5, median 17, mode 13 d. mean 17, median 14.5, mode 137. Which of the following is not a characteristic of the mode? a. It is the least used measure of central tendency. b. It is affected by the value of every piece of data. It may not exist in some sets of data. d. It is not affected by extreme values. 8. A box-and-whisker plot does not show the a. mean c. third quartile b. first quartile d. median 9. Which of the following is not a measure of spread in a set of data? variance c. mean b. interquartile range d. standard deviation Completion - Complete each sentence or statement with the appropriate term. 10. A variable can have only certain separate values within a specified range. 11. A. variable can have any value within a specified range. 12. The set of all individuals who belong to the group being studied by a survey is called a 13. A sample frame that does not reflect the characteristics of the population. causes bias 14. A data-collection method that consistently either under- or overestimates a characteristic of the population causes bias. 15. When a set of data is ranked from the highest value to the lowest, the middle value is the 16. Values that are distant from the majority of values in a set of data are 17. The difference between an individual value and the mean in a set of data is called a 18. The square root of the mean of the squares of all of the deviations in a set of data is 19 is the difference between the third quartile and the first quartile. 20. divide a set of ordered data into one hundred groups with equal numbers of values
