What is the difference between main effect and interaction effect in experimental communication?

When congress limited the size of washington, dc to 10 square miles, they could not have predicted the growth of the federal bureaucracy. which of the following conditions, do you suppose, is directly related to the inability of the federal city to expand? (select all that apply.)

What conclusion can be drawn from the information in the chart? a) africa's total number of hiv/aids cases makes up close to 20% of the world's total aids cases. b) poverty and lack of education are the only factors that have pushed the african aids rate to 6.1%. eliminate c) a major challenge facing african governments is finding a way to effectively combat the aids epidemic. d) north american aids rates are lower than the worldwide rate because of extensive government intervention and spending.

Who became a national hero when she refused to give up her bus seat to a white passenger in montgomery, alabama? a) rosa parks b) medger evers c) coretta scott king d) martin luther king jr.