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Independent or paired? (Statistics)

  1. Oct 15, 2008 #1
    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!!
  2. jcsd
  3. Oct 16, 2008 #2


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    Science Advisor

    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.
  4. Oct 16, 2008 #3


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    Homework Helper

    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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