Unsolved Problem: Are Outcomes of Two Inspectors Independent?

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Discussion Overview

The discussion revolves around the independence of outcomes from two inspectors in a factory setting who evaluate products as defective or not. Participants explore the implications of their inspection results and the conditions under which these outcomes may be considered independent or dependent.

Discussion Character

  • Exploratory
  • Debate/contested
  • Conceptual clarification

Main Points Raised

  • One participant questions whether the outcomes of the inspectors are independent, suggesting that if one inspector deems a product defective, it may increase the likelihood that the other inspector will also deem it defective.
  • Another participant seeks clarification on what is meant by "independent outcomes," asking whether it refers to the independence of ratings across different products or the independence of opinions on a single product.
  • A participant emphasizes that the independence of outcomes may depend on the inspection process and the assumptions made about the inspectors' evaluations.
  • There is a suggestion that formalizing the assumptions underlying the inspectors' evaluations is necessary to reach a conclusion about the independence of their outcomes.

Areas of Agreement / Disagreement

Participants generally agree that the outcomes may be dependent, particularly if one inspector's judgment influences the likelihood of the other's judgment. However, there is no consensus on how to formalize this relationship or the assumptions involved.

Contextual Notes

The discussion highlights the need for clarity regarding the assumptions made about the inspectors' evaluation processes and the definitions of independence being used. There are unresolved questions about how to formalize these assumptions and their implications for the independence of outcomes.

hypermonkey2
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Heres something i came across in a book but there's no solution...
take two inspectors in a factory (they can't talk to each other), and they inspect a series of products and they deem them defective or not. So the results would be (D,N), (N,N) ... where each coordinate is each inpectors verdict.
are the outcomes independent?

I would think not. But i cannot formalize that. thoughts?
 
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How do the two inspectors determine whether a product shoud be deemed defective or not defective?

What exactly do you mean by independent outcomes? That the ratings for different products of the series are independent? Or that that the two inspectors' opinions on one fixed product are independent? Or something else?

To give an answer to any of these question you need to specify how the inspectors decide upon their opinion regarding a (maybe defective) item.
 
They inspect the product. Essentially, i think that IF we assume that they perform some sort of inspection, that IF one inspector deems it defective, that it is MORE likely that the product actually IS defective, so it is MORE probable that the second inspector deems it defective too.
In that sense, the outcomes are dependent, no?
Right, it is the products of the series that are independent.
What do you think?
 
hypermonkey2 said:
Essentially, i think that IF we assume that they perform some sort of inspection, that IF one inspector deems it defective, that it is MORE likely that the product actually IS defective, so it is MORE probable that the second inspector deems it defective too.
In that sense, the outcomes are dependent, no?

I agree with you.
 
Great! How to formalize it?
 
You can't formalize the conclusion without the assumptions being formalized as well. Formalizing the assumptions would make the conclusion trivially follow.
 

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