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Explain dysmenorrhea and amenorrhea.
Customers' Preference
The inclination or predisposition of consumers towards certain products, services, or brands over others.
Blocking
A method used in experimental design to minimize the effects of nuisance variables by grouping units with similar characteristics.
Random Assignment
An experimental technique for assigning individuals to different groups in a study using randomization, ensuring that each participant has an equal chance of being assigned to any group.
Placebo
A safe medication or treatment recommended primarily for its mental comfort to the patient rather than its physical health benefits.
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