I'm working on a storage experiment for strawberry. There are several treatments and for one replicate, 10 fruits were used. As it was impractical to use fruits with same weight and ripeness, I tried to use similar fruits, but yet the weight and the colour of the fruits are different and the results, (brix and acidity) can vary with those conditions.

In some books, it suggests to use linear mixed effects regression models for statistical analysis for cases like this. Can someone please explain how to do that? Any other suggestions of statictical analysis is also welcome. 

Thanks in advance

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