In an experiment, subjects were shown a series of images on a computer screen, appearing usually at the top but occas...

Christy on June 11, 2019

Why not E?

Through process of elimination, I got down to D and E, but neither seemed like a perfect fit to me. Can you explain why E is wrong and how I could've come to the conclusion that D was correct?

3 Replies

on November 3 at 08:11PM

I think because it is a "must be true" question, answer E mentions that it is "rational" but the stimulus never mentions anything about rationality. For must be true questions you can only chose the answer that does not interject any outside the stimulus information. When I answer must be true questions you look to see if the answer choice just mentions information in the stimulus.

on April 26 at 12:29AM

I do not understand how I would shorthand this question to get to the answer or what strategy I would use. I find questions like these difficult with the parallel reasoning. Can you explain the setup and strategies please, and recommend any office hours that discuss this?

jing jing on June 5 at 11:40PM

Hi I am not an instructor but I was able to get to the correct answer from the sentence, “Instead, if they had simply guessed that the next image would always appear at the top, they would have been correct most of the time.”

The word “instead” at the beginning of the sentence tells us this is not the case that happened in the experiment. Thus, it must mean that some participants had chosen some downs, and some of these downs must have been incorrect. If all participants had chosen all down guesses correctly, they would have guessed correctly 100% but this violates the stimulus condition “instead, had they chosen up all up all the time, they would have been correct most of the time.” Also guessing all down correctly by all participants would make the participants correct 100%, thus violating another condition in the stimulus “They guessed correctly less than half of the time.”

And the quantifier “some” is nice since we don’t know the percentages of their guess down that were incorrect so any stronger quantifiers such as “most” or “all” would have made this answer choice not directly supported by the stimulus passage.

I hope that I explained it correctly. Please feel free to correct me. Thank you