Question

Science Experiments: What does Interpretation of Data mean?

Answer 1

It means you perform the experiment ... maybe several times ... you make
lots of measurements, and you collect a lot of numbers from the experiment. 
Then what have you got ?  You have tons of numbers.  That's your data. 

The numbers don't stand up on the paper and sing like a choir and tell you
the results of the experiment.  Somehow, at some point, YOU have to take
all the numbers, look them over, under, around, and through, from every
possible angle, and decide what the numbers are telling you. 
THAT's the interpretation of the data.

Answer 2

Interpretation is the act of explaining reframing or otherwise showing your own understanding of something. A person who translates one language into another is called an interpreter.