Suppose that an investigator tested the treatment and no-tre…

Suppose that an investigator tested the treatment and no-treatment groups at very different times and in different places. In addition to the typical threats to the two-group design, the investigator would have to worry about ____, a threat to internal validity that usually doesn’t trouble researchers who use a two-group design.

Minstrel show – In the 19th-century United States, a form of…

Minstrel show – In the 19th-century United States, a form of entertainment inwhich performers (usually white) enacted African American stereotypes bydarkening their faces with burnt cork or greasepaint, speaking in pseudodialect, and portraying established character types through song, dance, andcomical sketches.