Aresearcher hired by a department store wants to examine whether manipulating the room temperature to be hotter as opposed to cooler affects sales of air conditioners. the best method for answering this question would be

This would be a controlled experiment. You would randomly assign people into groups and watch their behavior as they interact with different temperatures. You would have two experimental groups and one control group.

the first successful, urban blues recording, selling more than 75,000 copies, was made in year 1920.

mamie smith recorded the first commercially successful example of the urban blues,   with the recording of “crazy blues”."crazy blues" was recorded on august 10, 1920, in new york city. within a month of the release of “crazy blues” it had sold 75,000 copies.

answer; strategic planning;