The hallmark of operant conditioning is 

Fastest acquistion of behaviour and rapid decrease of behaviour occur when reinforcement is no longer provided in

When a psychological test is useful in relating to other measures such as present academic grades or any other test scores, indicates

Consider the following statements :

Assertion (A) : Obsessions or compulsions cause marked distress, are time consuming and interfere with the person's normal routine.

Reason (R) : Obsessions are intrusive and mostly non-sensical thoughts, images or urges that the individual tries to resist or eliminate whereas compulsions are the thoughts or actions used to suppress obsessions and provide relief.

Now select your answer according to the coding scheme given below :

The mean raw score obtained by children in a given standard, gives us

Select the one that is correctly matched :