BME162 - 2022 - Participation Activity #2

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University of Waterloo *

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101L

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Mechanical Engineering

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Apr 3, 2024

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docx

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BME162 Winter 2022. Participation Activity #2 – Individual Activity. Due to LEARN Dropbox by Sunday, 20 February by 11:59 pm E.T. When examining the Never Cry Wolf case study using Signal Detection Theory, we examined the signal detection task from the perspective of the prisoner and the perspective of the guard. You are tasked with examining the signal detection task from the perspective of the prison security system. To answer this question, you will need to fully complete the 2x2 Signal Detection Theory Matrix. A template has been provided for you below for you to fill out. Make sure you describe : The ‘yes’ and ‘no’ decisions. The ‘signal’ and ‘noise’. A ‘hit’, ‘false alarm’, ‘miss’, and ‘correct rejection’. 2x2 Signal Detection Theory Matrix Template: State of the World (Security System Perspective) Signal Motion Detector & Prisoner Noise Motion Detector & No Prisoner Decision Yes Hit Alarm goes off and stops prisoner False Alarm Alarm goes off and prison goes into lockdown for no reason No Miss Alarm does not go off and prisoner escapes Correct Rejection Alarm does not go off and no escapes occur Now let us assume that in this scenario, we had the following data: Hit False Alarm Miss Correct Rejection 8 35 2 55 With this data regarding security system performance, calculate the sensitivity and specificity. Place your calculated values in the table below: Sensitivity (%) Specificity (%) 80 60
Additionally, speculate as to whether the response criterion is likely set more liberal or more conservative. This can be done in a few sentences (no more than three). The scenario is not specific because the signal is close to the noise, and correct rejection has a higher value, thus the response criterion is likely to be more liberal.
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