Dr Bloedorn Is a Health Psychologist Who Researches Nutrition

question 65

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) .
Which of the following threats to internal validity will Dr. Bloedorn NOT be worried about?

• A)Testing effect
• B)Attrition
• C)Demand characteristics
• D)Placebo effects

---

Definitions:

Internal Consistency

A measure of the reliability of a test or scale, assessed by the degree of interrelation among items within the test.

Internal Consistency

A measure of the reliability of a psychological test or assessment, indicating how well the items on the test measure the same concept or construct.

Spearman-Brown

A formula used in psychometrics to estimate the reliability of a test, particularly in relation to the length of the test.

Cronbach's Alpha

A statistical measure used to assess the reliability or internal consistency of a set of test or survey items.