Questions: Jenae's study ignored the fact that only some of her coffee choices had caffeine, even though her co-workers preferred caffeinated coffee. Therefore, Jenae decided to label one type of decaffeinated coffee as having caffeine to see what would happen. As she anticipated, this coffee became more popular with her co-workers, and they claimed that the extra boost of caffeine helped them focus on their work. The growing popularity of the decaffeinated coffee among co-workers, under the false impression that it gave them extra caffeine, is an example of a control group the placebo effect a treatment group a case-control study

Solution Steps

In this question, Jenae labeled a decaffeinated coffee as having caffeine, and her co-workers believed it provided them with an extra boost, which increased its popularity. This scenario involves a psychological effect where the belief in the presence of caffeine influenced the co-workers' perception and behavior.

The situation described is a classic example of the placebo effect. The placebo effect occurs when individuals experience a perceived improvement in condition or performance due to their belief in the efficacy of a treatment, even if the treatment is inactive or a sham.

Given the options:

• A control group: This is a group in an experiment that does not receive the treatment and is used as a benchmark.
• The placebo effect: This is when a person experiences a benefit after the administration of an inactive substance or treatment.
• A treatment group: This is a group in an experiment that receives the treatment being tested.
• A case-control study: This is a type of observational study often used in epidemiology.

The scenario matches the placebo effect, as the co-workers believed they were consuming caffeinated coffee and felt the effects, even though it was decaffeinated.

Final Answer