CHAPTER 13 Cooperative Group Activities 699 5. Out-of-class activity Divide into groups of three or four students. Investigate the relationship between two variables by collecting your own paired sample data and using the methods of Section 13-6 to determine whether there is a correlation. Suggested topics: • Is there a correlation between taste and cost of different brands of chocolate chip cookies (or colas)? (Taste can be measured on some number scale, such as 1 to 10.) • Is there a correlation between salaries of professional baseball (or basketball or football) players and their season achievements (such as batting average or points scored)? • Is there a correlation between car fuel consumption rates and car weights? • Is there a correlation between the lengths of men’s (or women’s) feet and their heights? • Is there a correlation between student grade-point averages and the amount of television watched? • Is there a correlation between heights of fathers (or mothers) and heights of their first sons (or daughters)? 6. Out-of-class activity See this chapter’s “From Data to Decision” project, which involves analysis of the 1970 lottery used for drafting men into the U.S. Army. Because the 1970 results raised concerns about the randomness of selecting draft priority numbers, design a new procedure for generating the 366 priority numbers. Use your procedure to generate the 366 numbers and test your results using the techniques suggested in parts (a), (b), and (c) of the “From Data to Decision” project. How do your results compare to those obtained in 1970? Does your random selection process appear to be better than the one used in 1970? Write a report that clearly describes the process you designed. Also include your analyses and conclusions. 7. Out-of-class activity Divide into groups of three or four. Survey other students by asking them to identify their major and gender. For each surveyed subject, determine the number of Twitter followers or Facebook friends. Use the sample data to address these questions: • Do the numbers of Twitter followers or Facebook friends appear to be the same for both genders? • Do the numbers of Twitter followers or Facebook friends appear to be the same for the different majors? 8. In-class activity Divide into groups of 8 to 12 people. For each group member, measure the person’s height and also measure his or her navel height, which is the height from the floor to the navel. Use the rank correlation coefficient to determine whether there is a correlation between height and navel height. 9. In-class activity Divide into groups of three or four people. Appendix B includes many data sets not yet addressed by the methods of this chapter. Search Appendix B for variables of interest, then investigate using appropriate methods of nonparametric statistics. State your conclusions and try to identify practical applications.
RkJQdWJsaXNoZXIy NjM5ODQ=