Stat 100 Jan. 7, 2002
What is statistics? • Methods for using sample information to make generalizations about populations.
Thought Question 1 A newspaper asked readers to return a questionnaire with questions about sex and violence on TV. 97% of 65,000 respondents were somewhat or very concerned about violence on TV. Do you think 97% of all Americans are concerned about violence on TV? Why or why not?
Thought Question 2 A recent newspaper article concluded that smoking marijuana at least three times a week resulted in lower grades in college. How do you think the researchers came to this conclusion? Do you believe that smoking marijuana causes lower grades? Is there another explanation for the result?
Thought Question 3 Suppose that you are designing a study to compare the effectiveness of two different methods for learning information. You’ll have one group of students use one method and another group use the second method. How would you assign students to groups in the first place?
To Get Started • Read Chapter 1.