Sample: One child with a phobia of buttons.

Sampling Technique: Opportunity sampling.

Research Method: Case study.

Controls: Not specified.

Ethical Issues: The study involved working with a vulnerable child, and the therapist needed to ensure the child's safety and well-being.

Results: The study found that the child's phobia of buttons was significantly reduced after therapy.

Conclusion: The study suggests that classical conditioning can be an effective treatment for phobias.

Results: Participants who were injected with epinephrine and were exposed to the euphoric confederate reported feeling happier. Participants who received epinephrine and were exposed to the angry confederate reported feeling angry.

Conclusion: The study provides support for the two-factor theory of emotion. When participants were physiologically aroused, they looked to the environment to explain their arousal.

Strengths: The study used a controlled experiment, allowing researchers to manipulate variables and isolate the effects of physiological arousal and cognitive labeling.

The use of a placebo control group allowed researchers to rule out the possibility that the participants' emotional responses were simply due to the injection itself.

Weaknesses: Ethical concerns related to the use of epinephrine and deception.