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31 December, 12:03

Emma is planning an experiment to examine whether reading to children increases their vocabulary size. She recruits two pre-school classes of 18-month-olds.

She assigns one of the classes to be read to three times a week for three months and the other classroom to play board games three times a week for three months.

She then measures and compares the vocabulary size of both groups.

What threat to internal validity should she be most concerned about?

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  1. 31 December, 12:11
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    The age of the child
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