If you have a computer at home, please download LoggerPro - a software package site-licensed to Park School:
https://parkscience.pbworks.com/w/page/351271/LoggerPro
Run the installer. When prompted for a password, type: ecosystem
Open the software and play around with it. If you have data for period (in seconds) vs. length (in cm, or whatever unit you used), plot it.
You may need to "autoscale" the graph -- to make it fit nicely. Do this by right-clicking and choosing autoscale (twice). On a Mac, right click is a two-finger tap on the keypad or CTRL-click.
If you are feeling ambitious, try a "curve fit" under the analyze heading.
If you are able, print out your period vs. length graph.
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