Explain the logic and components of regression analysis. What is the purpose of the correlation coefficient? A scatterplot?
What will be an ideal response?
Regression analysis--a statistical technique for characterizing the pattern of a relationship between two quantitative variables in terms of a linear equation and for summarizing the strength of this relationship in terms of its deviation from the linear pattern; the regression line summarizes the relationship between the independent and the dependent variables (positive, negative, and none; correlation coefficient--a summary statistic that varies from 0 to 1 or ?1, with 0 indicating that the relationship is completely described by the line representing the regression of the dependent variable on the independent variable; a scatterplot shows the location of each case in the data.
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If two polling firms asked identical questions of the same group of 1,000 people, yet reported different results, this difference would likely be caused by
A. failure to achieve a random sample. B. sampling error. C. the house effect. D. push polling. E. All of these choices are true.
The first reform of Mexican Judicial system instituted in 1994 under PRI President Ernesto Zedillo ________
A. provided complete authority to the executive for the appointment of judges of the Supreme Court B. gave the court the authority to declare unconstitutional any legislation passed by the legislature and signed by the president C. reduced the term of judges from 15 to 5 years D. limited the court's ability to settle intergovernmental disputes between state and national governments E. abolished the process of election of judges by the Senate
How do American free speech rights compare to European nations?
A) In America, free speech rights are more extensive than in Europe. B) In America, free speech rights are less extensive than in Europe. C) In America, free speech rights are about the same than in Europe. D) In America, free speech is prohibited unless it presents a "Clear and Present Danger."
Which of the following is NOT a means to coerce change from an agency if Congress is not satisfied with its performance?
a. eliminate its budget b. refuse to confirm presidential appointments c. eliminate the agency d. shift powers to a new agency e. overwork the staff to cause fatigue