Could someone look over the data of my SHM Lab?

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Homework Statement



We set up a spring with a weight and displaced the spring from equilibrium position. Using a recording device and a motion sensor, we found various data that I have put in the attached table.
When doing calculations for the lab, we ran into problems, but I simply want to make sure that the data we have collected is reasonable.

Homework Equations


D is the amount the mass was displaced. We used 2 and 4 centimeters.
ΔX was the difference between the spring when there was no mass added, and after the mass was added.
T and V were calculated directly from the output of the recording device (a graph of the motion).

The Attempt at a Solution



It looks alright to me, but our group is having trouble doing the calculations correctly in Excel. I just want to be sure that the data is not the source of our problems.
 
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What calculations have you been trying to do, and how have you tried to do them?