In order to test the effectiveness of the debate of the candidates for the president, researchers randomly contacted 1000 people on the phone. An attempt was made to contact all 1000 one day before the debate and ask their voting intentions. Only 910 were actually reached by phone; 80 out of the 910 people refused to participate. One day after the debate, 810 of the 910 people were reached and again asked their voting intentions. In addition they were asked if they had seen the debate on television. The before-after change of the viewers and non-viewers were compared to conclude which candidate was more effective in the debate. What kind of experimental design is being used? Describe relevant potential extraneous variables in this experiment. Can this experiment design rule out these extraneous variables?

Regardless of the breadth of the definition attached to the term law, there is an essential truth to the fact that at the core of the nation's expansive legal system lays a body of enforceable written rules meant to maintain order, define the outer limits of our interactions with one another and with our governments, and delineate legal rights and responsibilities. these rules derive from several sources, which collectively are called primary sources of law. there are also secondary sources of law, which are not laws in the technical sense for this assignment, identify and discuss the four types of primary sources of law. in your response, be sure to define each one. discuss what types of laws are derived from each source. identify the source of authority for each one. lastly, provide an example of a law from each source.