Answer:
False.
Step-by-step explanation:
An attitude can be defined as a way of thinking and feeling that one have for something or someone. And this feeling is revealed in one's behavior.
Psychologically, attitude is a set of beliefs and emotions that is depicted in the person's behavior is the way he/she act towards the place, person or thing.
The statement given that attitude is the belief is one's own effectiveness is wrong as it is not belief in one's effectiveness, but a belief and emotions about another person or thing which are shown in our way of acting and behavior towards them.
So, the answer is false.