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> Observational Study or Experiment? 1. Which of the following is an observational study and which is an experiment? (a) A Stat 113 instructor announces a study session to be held the night before a test. The instructor lists the students who attended the session and compares their scores to the remaining Stat 113 students' scores. (b) To determine whether a review session will improve his students' test scores, a Stat 113 instructor divides his class into two groups. He then requires one group to attend a study session and compares the test results of each group. Types of Sampling 2. Which sampling method was utilized? Why? (a) Student organization looking to get signatures for a petition camp out in front of Class of 1930 Lecture Hall (b) Select three students from a class to receive ice cream by putting all the students' names in a hat and picking out three names randomly. (e) Select three female students and three male students to receive ice cream by putting all the men's names in one hat and all the women's names in a different hat and picking out three names from each hat (d) In Fall 1995, the BBC in Britain requested viewers to call the network and indicate their favorite poem. (e) Divide the class into four groups (freshman, sophomore, junior and senior) and take a random sample of two students from each group. (1) Priceline.com randomly e-mails a Customer Satisfaction Survey for certain transactions done on its site in which customers choose to either respond or not. (g) Sarah has a hunch that most of the students at JV are against the new dress code. At lunch, she takes an opinion survey of the girls at her table. (h) A new history teacher wants to get some feedback on her teaching. Because she feels that males and females might perceive her differently, she makes a list of all her students and then separates them by gender. Within each group, she randomly chooses 10 students to ask for feedback