A teacher gives her class at least one unannounced quiz every week. The

students never know which day it will fall on. The teacher is attempting to

influence their study habits by using a

A. variable-ratio

B. fixed-ratio

C. variable-interval

D. fixed-interval

Variable-interval

Explanation:

A variable interval involves reinforcing a behavior after an interval of time has passed. The interval of time might not be the same but it revolves around some average length of time. This enforces persistence in behavior over a long time. The actions bby the teacher is a clear example of variable interval cause she want the students to be persistent in their study.

C

Explanation:

Variable interval

A variable-interval schedule of reinforcement is one in which the reinforcement (the reward) is provided after an inconsistent amount of time has passed and following a specific behavior being performed

A teacher gives unannounced quizzes at unpredictable times. Therefore students must study equally every night is a case of variable-interval, because its attempting to reinforce a steady study life

answer: there were new carvings etched into the back of the sculpture and each shoulder was turned into a symbol of the birdman.