Independent or paired? (Statistics)

AI Thread Summary
The discussion centers on whether the repair cost estimates from two appraisers for the same car damages are independent or paired. It concludes that the samples are paired because the measurements are taken from the same vehicles, indicating a dependency between the appraisals. A 95% confidence interval for the mean difference in repair costs is mentioned, with a request for clarification on its significance. The conversation emphasizes that trained appraisers' values are not purely random, reinforcing the paired nature of the data. Understanding these concepts is crucial for accurate statistical analysis in similar scenarios.
kash-k
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I was just doing some revision and came across a sticky thought -

Suppose you got two appraisers for 9 car damages and both give different prices for the repair. Would the samples be independent or paired? I reckon it's paired but I can't put a reasoning behind it!

And I also did a 95% confidence interval for the mean difference of repair costs but what is the damn meaning of the result?!

Thanks guys!
 
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Do you believe that the value a (presumably trained) appraiser comes up with for car damage is purely random? If so then they are independent.
 
Since the measurements are on the same vehicles, they are dependent - this is an example of a matched-pair (a.k.a. paired-difference) data collection.
 

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