How many shoplifters will be correctly identified

Assignment Help Other Subject

Reference no: EM133385382

Case Study: Assume that the facial recognition software has a hit rate is 90% and the false positive rate is 10%. (Here's what I mean: Assume Bob Jones is a known shoplifter with an image on file. If Bob Jones enters the store, the software will match him to his picture 90% of the time. That's a hit because the software made a correct match. If Jim Garcia looks sort of like Bob Jones, he might be accidentally matched with Bob Jones. That's a false positive because the software matched an innocent person with a known shoplifter. This kind of error happens about 10% of the time.)

Prior Probability: Assume that 1 in 500 people is a known shoplifter.
Here's the question: If a match is made, how likely is it that person is actually a shoplifter? (Would Walmart be wasting time and money following these people around?)
Let's do the math using a sample of 10,000 people.
Of the 10,000 people, how many will be known shoplifters?

Question:

How many shoplifters will be correctly identified? (Use the hit rate.)
Of the 10,000 people, how many will be innocent?
How many innocent people will be incorrectly identified as shoplifters? (Use the false alarm rate.)
In all how many people will be identified as shoplifters?
What percentage of these people will be actual shoplifters?
How many shoplifters would go undetected?

Reference no: EM133385382

Questions Cloud

What is known about the vulnerability of the brain : Given what is known about the vulnerability of the brain, should parents let their children play a high-impact sport such as Pop Warner? Why or why not?

What did the counsellor identify as social factors : What did the counsellor identify as social factors of the primary focus selected by you? How did the counsellor build the therapeutic session for you

Observations are frequently used in early childhood : Observations are frequently used in the early childhood classroom to make instructional decisions for students and groups.

Define each of the four types of error variance : Define each of the four types of error variance. For each type, describe at least one practical way to implement the assessment to minimize or overcome

How many shoplifters will be correctly identified : How many shoplifters will be correctly identified? (Use the hit rate.) Of the 10,000 people, how many will be innocent? How many innocent people will be

Conversations more respectfully and productively : what strategies we can use to frame these conversations more respectfully and productively. Are there ways to find common ground among people who fundamentally

Observations are frequently used in early childhood : Observations are frequently used in the early childhood classroom to make instructional decisions for students and groups

Why are they used if many worry about bias and validity : Do you think you have a good memory? Why or why not? What techniques do you typically do when you need to study or memorize things?

What is a sensitive period and describe one example : What is a sensitive period? Describe one example of a sensitive period (from lecture or the assigned readings), with supporting evidence.

User Account

All Pages