Exam 24: Two-Way Tables and the Chi-Square Test

Here is a two-way table of the numbers of college students (U.S. citizens only) classified by racial/ethnic group and by whether they attend a public or a private college. The entries are in thousands of students. What percent of non-Hispanic black students attend public colleges?

A sample of 123 respondents is asked, "Should corporations attempt to use their financial resources to influence public policy, especially with respect to social issues?" The responses are as follows: What is the expected number of respondents in State A who said Yes?

Simpson's paradox refers to the fact that

During basketball practice, Ulrich made 80% of his free throws, while Franz made only 70%. Ulrich also did better in the game, making 60%, while Franz made only 50%. Here are the data: Overall (practice plus game),

Which of these would be an example of Simpson's paradox?

A sample of 123 respondents is asked, "Should corporations attempt to use their financial resources to influence public policy, especially with respect to social issues?" The responses are as follows: The chi-square statistic for this table has how many degrees of freedom?

Here is a two-way table showing enrollment data for full-time undergraduate students in U.S. colleges and universities. The entries are thousands of students: What is the expected number (in thousands) of 18 to 21 year olds in 4-year programs?