统计学基础（英文版第7版）-网上答案.pdf

TRY IT YOURSELF ANSWERS Chapter 1 2. There is no way to tell why the people quit smoking. They could have quit smoking as a result of either chewing the Section 1.1 gum or watching the DVD. The gum and the DVD could be confounding variables. To improve the study, two experiments 1. The population consists of the responses of all ninth to could be done, one using the gum and the other using the twelfth graders in the United States. The sample consists DVD. Or just conduct one experiment using either the gum of the responses of the 1501 ninth to twelfth graders in the or the DVD. survey. The sample data set consists of 1215 ninth to twelfth 3. Sample answer: Assign numbers 1 to 79 to the employees of graders who said leaders today are more concerned with the company. Use the table of random numbers and obtain their own agenda than with achieving the overall goals of the 63, 7, 40, 19, and 26. The employees assigned these numbers organization they serve and 286 ninth to twelfth graders who