A Pediatrician Is Interested in Determining If Cognitive Development Scores

question 11

Short Answer

A pediatrician is interested in determining if cognitive development scores are lower for low-birthweight infants than normal infants. She has 49 active cases involving low-birthweight infants from who she could collect data to compare to the national average. What would power be assuming the following effect sizes and α = .05?
a.
=.20
b.
=.50
c.
=.80

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Definitions:

Behavior Modification

A psychological treatment method that alters undesirable behaviors through rewards, punishments, or other strategies.

Tokens

Symbolic, often physical, items used in a token economy system to reward desirable behavior and which can be exchanged for other rewards.

Biofeedback

The use of sensitive equipment to give people precise feedback about internal physiological processes so that they can learn, with practice, to exercise control over them.

Spinal Cord Injuries

Damage to the spinal cord that causes changes in its function, potentially resulting in loss of mobility or sensation.