The National Association for the Education of Young Children advises that, when it comes to screen time, preschoolers should be exposed to:
a. no more than 2 hours a week.
b. no more than 2 hours a day.
c. no more than 4 hours a day.
d. no more than 4 hours a week.
B
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Matching as a control strategy is most useful when pairing subjects from
a. different populations. c. either a or b b. the same population. d. neither a nor b
The Pearson correlation coefficient is used to determine both the ______ and ______ of a relationship.
A. interval; ratio B. interval; scale C. strength; direction D. difficulty; alternatives
?"Healthy. Delicious. Drink Ovaltine!" Which of the following claims represents the implied conclusion of this argument?
A. ?Ovaltine is healthy. B. ?Ovaltine is delicious. C. ?You should drink Ovaltine. D. ?None; this is not an argument.
The teacher's role in children's play should be:
a. only as an observer. b. as a participant. c. nondirective. d. directive.