Good afternoon, Expert

Hello expert, can you provide "the Conceptual Hypothesis", "the Research Hypothesis", and "the Null Hypothesis" of these studies below:

( If you can please label each study, label each hypothesis , for an easier understanding for me, thank you)

Study I

A research team is interested in the relationship between personality and social interaction. With a survey, an investigator records various social and personality variables of a group of participants. Among the variables, the investigator specifically evaluates the correlation between Extraversion score and number of Facebook friends.

Study II

. A research team is interested in the relationship between arousal and performance. An investigator administers, to 4 groups of participants, 4 doses of caffeine (0mg, 40mg, 80mg, 120mg). Afterward, the investigator measures performance on a reaction-time task where participants must hit a button as quickly as possible when a signal is given.

Study III

A research team is interested in the relationship between gender and aggression. An investigator observes children on the schoolyard playground. The investigator records the number of fights that each child engages in. The investigator then compares the girls and boys, on the total number of fights they engage in.