9. 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. c. It may not exist in some sets of data. d. It is not affected by extreme values. 10. A box-and-whisker plot does not show the: a. mean c. third quartile b. first quartile d. median 1 1. Which of the following is not a measure of dispersion in a set of data? a. mean c. variance b. interquartile range d. standard deviation 12. Which of the following would likely show a strong positive linear correlation? a. Grades on an English test and Heights of Students b. the height of corn in a field and the amount of precipitation in the growing season c. number of defective light bulbs produced and the time of day they were manufactured d. annual income of car buyers and colour of cars sold 13. If each number in a set of data increased by two, which of the measures of spread would stay the same? a. the range c. the interquartile range b. the percentiles d. all of the above 14. Which statement is FALSE about the interquartile range (IQR)? a. an outlier lies more than 1.5 times the IQR from Q1 or Q3 b. to calculate the IQR, subtract Q3-Q1 c. the median always lies at the middle of the interquartile range d. it contains the middle 50% of the data 15. Which of the following best represents reliable data? a. representative of the entire population b. can be duplicated c. the sample responses can be trusted d. none of the above1. What is the dependent variable in a correlational study of amounts of sunlight and the heights of tomato plants? a. the types of soil c. the heights of the tomato plants b. the angle of the sun d. the numbers of hours of sunlight 2. What is the independent variable in a correlational study of ice cream sales and air temperature? a. the amount of ice cream sold c. the temperature each day b. the number of people buying ice cream d. a) or c) 3. Which set of data would probably show a strong negative linear correlation? a. resale values of computers and their ages b. heights volleyball players can jump and the strength of their leg muscles c. numbers of people at a water park and the air temperature d. scores on a mathematics test and the number of hours spent studying for it 4. A set of data with a correlation coefficient of -0.75 has a a. strong negative linear correlation c. moderate negative linear correlation b. weak negative linear correlation d. little or no linear correlation 5. The correlation coefficient for weed growth in a lake and temperature was found to be - 0.895. The scatter plot for the data would have: a. an array of dots with no discernible pattern to them b. dots clustered around a line sloping up to the left c. dots tightly clustered around a line sloping up to the right d. a cluster of dots in the middle of the graph 6. 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 c. 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 7. An outlier is a data point that: a. should sometimes be left out of a statistical analysis b. may be an abnormal result c. may significantly affect the calculation of the correlation coefficient d. all of the above 8. 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 17, median 14.5, mode 13 b. mean 19, median 17, mode 13 d. mean 14.5, median 17, mode 13