Dr. zilgar has two groups of students who are otherwise equivalent study a chapter in a textbook. one group is assigned to study while classical music is playing and the other group is assigned to study while rock music is playing. he then measures how much they learn about the chapter. dr. zilgar’s research design is

Experimental          

Explanation:

Experimental Research Design- It is primarily used to explore the cause and effect relationships and to study the relationship between different variables. Researchers use this research design to compare 2 or more groups of 1 or more measures. In experimental design, the researcher tries to understand the relationship between dependent and independent variables. An experimental research is contemplated to be successful only when the researcher states that the change in the dependent variable is only because of the manipulation of the independent variable.

There are 3 principles of Experimental research design: randomization replication, and local control.

all freedom fighters demanded for constitution. so british finally granted india it's freedom. then a constituent assembly was formed. it's chair man was rajendra prasad and its deputy chairman was dr. br ambedkar.

this assembly take the time of about one year than our constitution was finally formed.

explanation: