The end of the Cold War has meant massive cuts in American nuclear armaments

Which of the following benefits do childcare programs in the United States provide?

A. $135 per month per child to all families until a child is 18. B. Temporary assistance to all families until a child is 21. C. Free medical assistance for all children until the age of 18. D. $85 per month per child to all families until a child is 18 E. Temporary assistance to children belonging to only the poorest families.

Sally selects classrooms of first graders to study the effects of teaching styles on math

achievement. This is an example of ________________________. a) stratified random sampling b) cluster sampling c) proportional sampling d) sampling error