substraction of sequential records

D

DialAround

I need to calculate moving ranges in either a report or query. Currently my
query returns TestTime (ascending) and TestResult. The moving range is the
absolute difference between two consecutive samples.
TestTime TestResult MovingRange
8am 20 --
9am 24 4
10am 21 3
11am 26 5

Once all the moving ranges are calculated, I need to report the average of
the moving ranges.
 
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