Butter vs shortening in cookies. HELP! Experiment went wrong, need answers?

WhoaItsPaige!

New member
For a school science project we had to come up with our own experiments to show the scientific method. Mine questions was Does replacing butter with butter-flavored shortening increase the thickness of a chocolate chip cookie? I did research and came up with the hypothesis that it would increase the thickness. So i made the two batches of cookies one with butter and one with shortening. Now the package said to add water with the shortening but i didn't do that. My experiment went the complete other way, the butter cookies were thicker than the shortening ones.
At first i thought this happened because i did not add the water but after more research i found out that not having water made them thicker. I need a conclusion to why my hypothesis was wrong but i have no idea. PLEASE HELP!
 
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