When crystal learned to play the piano as a child, her dad would reward her with candy as she practiced. sometimes he gave her candy after 6 minutes of practice, then after another 15 minutes, and then again after another 10 minutes. what type of reinforcement schedule is described here?

The correct answer is variable interval schedule. It is because this is considered to be a type of operant conditioning reinforcement by which the reinforcement is likely to be given to the response after a specific time has passed by which the time is likely unpredictable as it changes or variable schedule.

not  

cuba  

russia  

iraq  

el salvador  

explanation:

known as the land of volcanoes, el salvador has visit seismic tremors and volcanic movement. it is the main nation in central america that does not have a coastline on the caribbean sea. about portion of all salvadorans live in the wide open. they are poor and don't have power or running water in their homes. in 1525, pedro de alvarado, a lieutenant of cortés's, vanquished el salvador. el salvador, with alternate nations of central america, pronounced its freedom from spain on sept. 15, 1821, and was a piece of a league of central american states until the point when that association broke up in 1838.

answer; ///attempts to change more than once behavior at the same time;