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4.1 Basic Probability Concepts 1 41
C. is engaged with his or her workplace or is a U.S. worker? d. Explain the difference in the results in (b) and (c). 4.13 Where people turn for news is different for various age groups. A study conducted on this issue (data extracted from P Johnson, "Young People Turn to the Web for News," USA Today, March 23, 2006, p. 9D) was based on 200 respondents who were between ages 36 and 50 and 200 respondents who were over age 50. Of the 200 respondents who were between ages 36 and 50, 82 got their news prima-rily from newspapers. Of the 200 respondents who were over age 50, 104 got their news primarily from newspapers. Construct a contingency table to evaluate the probabilities. If a respondent is selected at random, what is the probability that he or she a. got news primarily from newspapers? b. got news primarily from newspapers and is over 50 years old? C. got news primarily from newspapers or is over 50 years old? d. Explain the difference in the results in (b) and (c).