BME162 - 2022 - Participation Activity #2
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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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