The activities that members of Congress undertake while they are in Washington; these activities might include committee and subcommittee meetings, time on the floor of the chamber, meeting with constituents, interest groups, other members, and staff,

Which of the following is most closely associated with the concept of "sampling error"?

A) operational definitions in experimentation B) differences between males and females on the dependent measure C) electronic hardware failures during sampling D) natural variability among the means

It is impossible to directly measure

A) extraneous variance. B) error variance. C) between-groups variance. D) within-groups variance.