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MatroZZZ [7]
3 years ago
10

Emma is planning an experiment to examine whether reading to children increases their vocabulary size. She recruits two pre-scho

ol 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?
Social Studies
1 answer:
Lina20 [59]3 years ago
5 0
The age of the child
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Letter A and Letter D are correct.

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