Duke is practicing his spelling in the classroom. duke is going to receive reinforcement after six demonstrations of the target behavior, which is spelling a word correctly.

which of the following statements is true?
a.
duke is on a fixed-interval schedule of reinforcement.
b.
duke is on a variable-interval schedule of reinforcement.
c.
duke is on a fixed-ratio schedule of reinforcement.
d.
duke is on a variable-ratio schedule of reinforcement.

The correct answer is C. Duke is on a fixed-ratio schedule of reinforcement.

Fixed refers to the delivery of rewards on a consistent schedule. Ratio refers to the number of responses that are required in order to receive reinforcement. So in this example, the fixed-ratio schedule is that a reward will be delivered for every sixth correct spelling made by Duke.  

fluid balance is an aspect of the homeostasis of organisms in which the amount of water in the organism needs to be controlled, via osmoregulation and behavior, such that the concentrations of electrolytes (salts in solution) in the various body fluids are kept within healthy ranges. the core principle of fluid balance is that the amount of water lost from the body must equal the amount of water taken in.