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Questions and Answers
What is the relationship between test scores and district income in the California data set?
What is the relationship between test scores and district income in the California data set?
- Negative correlation
- No correlation
- Strongly positive correlation (correct)
- Random correlation
What are two economic background variables used in the analysis?
What are two economic background variables used in the analysis?
- Percentage of students passing tests and district population
- Number of teachers per student and percentage of students graduating
- District income and the size of school buildings
- Average annual per capita income and percentage of district families qualifying for income assistance (correct)
Why does the scatterplot of test scores against district income show a peculiarity?
Why does the scatterplot of test scores against district income show a peculiarity?
- Points are uniformly distributed
- Nonlinear relationship between test scores and income (correct)
- Points are clustered in the middle
- Most points are above the OLS line
What characterizes a nonlinear function?
What characterizes a nonlinear function?
For the California data set, what is the median district income in terms of per person?
For the California data set, what is the median district income in terms of per person?
What range of district income values indicates a peculiarity in the relationship with test scores?
What range of district income values indicates a peculiarity in the relationship with test scores?
What happens when the effect on Y of a change in one independent variable depends on the value of that variable?
What happens when the effect on Y of a change in one independent variable depends on the value of that variable?
What is an example of a nonlinear regression function where the effect on Y depends on the value of X1?
What is an example of a nonlinear regression function where the effect on Y depends on the value of X1?
What is the difference between linear and nonlinear population regression functions?
What is the difference between linear and nonlinear population regression functions?
How is the nonlinear regression function in Figure 8.1b different from the linear population regression function in Figure 8.1a?
How is the nonlinear regression function in Figure 8.1b different from the linear population regression function in Figure 8.1a?
Can nonlinear regression functions be considered versions of the multiple regression model?
Can nonlinear regression functions be considered versions of the multiple regression model?
What is an example of a nonlinear effect in everyday life?
What is an example of a nonlinear effect in everyday life?
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