_____ is used to control for more than one variable.

In Buckley v.Valeo,the Supreme Court upheld restrictions on the amount of money an individual could contribute to his or her own campaign

Indicate whether the statement is true or false

In Russia, a presidential veto can be overridden by a. a two-thirds majority vote in both the Duma and the Federation Council

b. a two-thirds majority vote in the Duma. c. a two-thirds majority vote in the Duma and a simple majority in the Federation Council. d. a simple majority vote in both the Duma and the Federation Council. e. a two-thirds majority vote either the Duma or the Federation Council.