The study hypothesis is, "Premature infants who receive skin-to-skin tactile stimulation gain weight at a more rapid rate than premature infants who do not receive skin-to-skin tactile stimulation.". What is the independent variable?
1. Premature infants.
2. Weight gain.
3. Rapid weight gain.
4. Skin-to-skin tactile stimulation.
4
Rationale 1: Premature infants are the study population.
Rationale 2: Weight gain is the dependent variable.
Rationale 3: Rapid weight gain may be an outcome of the independent variable intervention.
Rationale 4: The presumed cause, the treatment or intervention, is skin-to-skin stimulation.
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