Explanation for Question 13 From the Reading Section on the 2021 March Sat
Question number 13, which choice, 2 best ports. The idea that the researchers needed a mechanism to determine whether changes 3 in public opinion were the results of the experimental stories and not some other 4 factor. So here we're talking about changes 5 in public opinion and whether they were the results of the experimental stories. 6 So we're looking for kind of a control that was potentially used by our 7 researchers, um, in order to assess what exactly was causing the observed 8 changes that they were detecting. So looking at answer choice, 9 I lions one to four, this says assessing the influence 10 of news media is tricky researchers, can't peer into voting booths or people's living 11 rooms and news organizations. Aren't typically willing to have outsiders interfere with their contents. 12 This is choice a, um, and it doesn't really touch on any type of 13 control that the researchers were actually using here. 14 So we can eliminate it. 15 Answer choice B is lines five to seven. 16 That's why I took a team of social scientists five years to get us 17 news organizations to run an unusual set of experiments. 18 Um, again, this kind of plays off of the meaning and B neither suggests 19 anything about the types of controls that the author, 20 the research authors used to evaluate whether the effects they were, 21 they were finding were kind of due to what they were trying to study 22 or other factors. Um, 23 answer choice C is line seven to 11, 24 instead of simply track...