What is the source of de facto segregation and discrimination?

How many null hypotheses are tested in a two-way analysis of variance?

a. 1 b. 2 c. 3 d. 4

The only formal method used so far to propose an amendment to the Constitution is

A. the popular vote of the people. B. a two-thirds vote in favor of it by both houses of Congress. C. state legislatures or conventions in three-fourths of the states. D. a national convention. E. a proposal by the president.