Which of the following is the process of drawing cases from a master list by first choosing a random sample then choosing subsequent examples at set intervals?

Interest groups are important subjects of study in American politics because __________

a. they are always successful in getting their demands met by government b. they provide a venue for citizens to participate in government c. they determine what issues get covered in the media d. they determine who runs for elected office

You plan to develop a survey and would like to compute a single score to represent the construct you are measuring. Which type of items should you use?

a. open-ended b. forced alternative c. multiple choice d. Likert scales