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E-15 within item analysis

Question asked by Claire Blatt on Sep 23, 2019
Latest reply on Sep 24, 2019 by Ken Black

When running an item analysis for a quiz, 3 questions had Point biseral greater than 1 (1.09, 3.56, -3.56, -5.97), and the number is followed by E-15.  What does this mean?

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