Before beginning a study on the health effects of obesity, a group of researchers agree that, for the purposes of their research, anyone with a Body Mass Index greater than 30 kg/m² will be considered obese. This is an example of _______________
A) a confounding variable
B) an operational definition
C) convenience sampling
D) an appeal to common sense
Answer: B
Rationale: Operational definitions are statements that describe the procedures (or operations) and specific measures that are used to record observations. By carefully defining the terms in a study, everyone can understand exactly how the variables are objectively measured.
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Kiran, age 6, is very reserved even around those close to her. Her teachers describe her as anxious and lonely, even though other children try to play with her. These can be described as ______
a. Internalizing symptoms b. Delirium c. Externalizing symptoms d. Avolition
If Chinwe and Callista are both developing breasts, how long will the process take?
A) Both girls will "finish" their development in about 2 years. B) Both girls will finish their development in about 4 years. C) Both girls will finish their development about 9 years. D) The rate of development is apt to differ from girl to girl.