The 'Fair Test'

A P7 pupil was shown a picture of two almost identical plants, one in a black box, the other in a glass box. (CASE lesson 4). She was asked if this was a fair test to show whether plants grew better in light or dark conditions.

The dialogue went like this:

“Is this a fair test?”

“Aye!”

“Why do you think that?”

“Well, it’s a plant. It’s no’ like it’s got feelings or nothing. What does it care if it’s in a black box? So it’s fair enough.”
 

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