How Many of the Then 15 EU Members Adopted the Euro

question 5

Multiple Choice

How many of the then 15 EU members adopted the Euro as their new currency, as part of the Eurozone on 1 January 2002?

• A) 10
• B) 12
• C) 15
• D) No member countries joined on 1 January 2002.

---

Definitions:

Observer Effect

The phenomenon in which the act of observation alters the behavior of the subject being observed, often considered in psychological research and quantum physics.

Experimenter Bias

A form of research bias where the expectations of the researcher unintentionally influence the outcome of an experiment.

Subject Bias

A form of bias caused by variations in participants' responses for reasons unrelated to the experimental manipulation.

Rating Scale

Assessment in which a numerical value is assigned to specific behavior that is listed in the scale.