Quiz 2 answer sheet

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Jan 9, 2024

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Isabella Donoso Quiz 2 Answer sheet Question 1: We are trying to identify an event with evidence, which in this case is looking for a recognizable character in a coffee shop. A hit would be looking for Phoebe by listening to her while she is singing and asserting correctly. A miss in this situation would be someone telling me Rachel is there, and my response is that she is not there, while she is in fact in the coffee shop. A false alarm would be stating that Chandler is there after looking at someone who dresses like him, but he is not there. And finally, a correct rejection would be me strongly saying that Monica is not there, and she is not there because she is working. Question 2: In this case, sensitivity, or d’, would be correctly identifying if there is one of my friends in the coffee shop. Beta or response criterion would be how well I would detect if my friends were there, when they are there, and inform they are not there when they are not present. Question 3: I f you increase the size of your beta, you will decrease the probability of correctly detecting your friend's face from others (hit rate). If your sensitivity is unchanged, this operation will not change your false-alarm rate. Question 4: By increasing beta, you tend to be more reserved on when to state a positive answer. If sensitivity remains unchanged and you are more likely to say no (beta), chances of getting a false alarm is lower. An example for this case is if you are looking for Chandler based on his voice as a signal, and you say he is not there, and you are correct. Question 5: For radiologists to improve their ability to detect evidence of tumors in images, they could have other radiologists handing them out images in which they have found it hard to detect a tumor. Also, they could try with different images (previously revised) and describe the visible characteristics that define the tumor. That way, the doctor who formerly detected it, could confirm the statements. Question 6: One way in which radiologist could improve their decision criterion would be by having a consult with patients, so then they could inform the doctor about any other health issue they had. This could lead radiologists to better results with investigation. Also, if radiologists do this, they can consult with their colleagues about similar cases having already the background information of the patient. Question 7: In this specific context, a vigilance decrement would result in more defective crackers delivered to clients. Many defective crackers would be packaged since there is no supervision necessary to have an effective product. Question 8: If there is a decrease in the individual’s ability to detect signals, the employee could mistake good crackers for bad crackers, and vice versa. They could miss non-targets and worse, have false alarms by targeting a good cracker, and then slowing down all the process. Question 9: One strategy that might support d’ overtime would directly be more involved in vigilance. Also, having more people on vigilance would work, as it is easier if there are more people doing the task. Question 10: A theory that could work for this situation is that individual’s eyesight can get tired by performing the same tasks by hours. This could cause a lower hit rate, or higher false alarms.

Question 11: A way in which workers could improve their performance is by looking into the rhythm the machine follows, or a pattern in good and bad crackers.

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