Nmeasuring perceptions of a stranger, why did you choose to use some trait adjectives (warm, friendly, caring) and not others (talkative, clean, detail-oriented)? to focus only on traits that relate to warmth and friendliness to understand how different coffee flavors influence perceptions of warmth and friendliness to focus on general traits that provide information beyond warmth and friendliness to understand how prior coffee-drinking experience influences perceptions of war

The correct answer is A. The reason for the use of trait adjectives, such as: warm, friendly and caring, when measuring perceptions of a stranger, is to emphsize those characteristics the person has that relate to warmth and friendliness, also showing they demonstrate a concern for  others, by being a caring person.

this null effect is caused by a weak manipulation and ineffective internal validity. in a scientific study, as the one dr. morimoto is trying to perfom, internal validity refers to the confidence placed in the cause-effect relationship and to how well an experiment is done and able to eliminate confounding variables.