Lauren, a social psychologist, hypothesizes that the best way for a young woman to increase the number of friends she has on a social networking site is to place a smiling display picture in her profile. Lauren wants to establish a cause-effect relationship between these two variables. In order to accomplish her objective, Lauren should use:.
A. a survey
B. correlational research
C. experimental research
D. an interview

experimental research

Explanation:

Experimental research it is the methodology in which a hypothesis is developed and then a specific set of steps(procedure) is carried out to corroborate or refute that hypothesis.

Here Lauren has developed an hypothesis that smiling display picture on social networking sites tends to increase number of friends. She wants to validate this hypothesis and hence experimental research is best suitable methodology here.

the earthquake in haiti was a magnitude of 7.0 according to the u.s geological survey yet the smaller earthquake in haiti killed more than 200,000 and left more than 1.2 million people homeless. the chile earthquake was a magnitude of 8.8 and 500 times more stronger but chile's earthquake only injured 712 people.

answer; ewing's sarcoma;