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Originally Posted by SteveEisenberg
Your criticism could easily be spun the other way.
Perhaps that made the iPad users more tired and sleep better.
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Perhaps it did, perhaps it didn't. That's the whole point - by adding spurious differences between the two cases they are just muddying the waters and invalidating the experiment.
It's fundamental experimental discipline - if you're looking too see if there is an effect caused by X, you try your hardest to make sure X is the only difference between the groups.
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However, to accuse the researchers of being pro-Apple (even though the senior author acknowledged being an Apple consultant) would be mistaken as well.
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I have never made such an accusation.
/JB