Which oA carefully controlled artificial situation that allows researchers to manipulate variables and measure their effects is called a/nf the following statements best describes the Madisonian Model? The Madisonian model gives a leader the sole power to make military-related decisions. The Madisonian model separates the powers of the national government into three different branches. The Madisonian model provides for a division of powers between a central government and several regional governments. The Madisonian model relies entirely on the centralization of all powers to one branch of government