统计学基础（英文版第7版）-网上答案.pdf
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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
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