Dr. Pena is conducting research about how people form impressions of others and how they interpret one another's behavior in a variety of situations. Dr. Pena is probably a

its a hope it good luck

hygrometers and hair thermometers (often found as part of hygrometers/psychrometers) can be used to measure humidity. barometers are used to measure atmospheric pressure, while anemometers are used to measure wind speed. so the 2nd and 4th choices should be the correct answers.

answer; the president uses mass media to gain support for policies;