By using __________ assignment of participants to treatment conditions, investigators increase the chances that participants characteristics will be equally distributed across treatment groups.
A) sequential
B) random
C) systematic
D) correlational
Question 2
In an experimental study examining whether children who are read to more often score higher on vocabulary tests in first grade, the independent variable would be the __________.
A) frequency of read-alouds
B) type of books parents read
C) childs vocabulary score
D) difficulty of vocabulary words
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