A new machine is set or calibrated to fill tubes of toothpaste at precisely 6.75 ounces. Then,once the machine is running,a sample of six tubes is taken every three hours and weighed with the following results: 
The measurement of quality is based on ________.
Definitions:
Clinical Trials
Research studies performed in people that are aimed at evaluating a medical, surgical, or behavioral intervention.
Risk Factor Approach
A method focusing on identifying and mitigating elements that increase the likelihood of developing diseases or injuries.
Community Trials
Studies that test the effectiveness of interventions on large groups or communities rather than individual participants to determine community-wide effects.
Researcher Bias
A form of bias that occurs when the preferences, beliefs, or prejudices of a researcher influence the conduct of research or interpretation of its results.
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