Dr Bloedorn Is a Health Psychologist Who Researches Nutrition

question 63

Multiple Choice

Dr. Bloedorn is a health psychologist who researches nutrition. She is curious as to whether a new drink additive will help people consume fewer calories during a meal. The drink additive is a white, odorless, tasteless powder that a person can add to any drink. She collects a random sample of 63 overweight students on campus and measures the calories they eat during lunch using a bomb calorimeter. She then gives this additive to the same 63 participants to use at dinner and measures how many calories they eat (again using the bomb calorimeter) .
The addition of a control group that does not use the drink additive would help Dr. Bloedorn address which of the following threats to internal validity?

• A)History
• B)Demand characteristics
• C)Instrumentation
• D)Placebo effects

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