RESEARCH STUDY 10.2 Dr. Bloedorn Is a Health Psychologist Who Researches Nutrition. She

Multiple Choice

RESEARCH STUDY 10.2
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) .
-Refer to Research Study 10.2 above to answer the following question. Which of the following threats to internal validity will Dr.Bloedorn NOT be worried about?

A) History
B) Attrition
C) Instrumentation
D) Placebo effects
E) She should be worried about all of the above