Develop Hypotheses and Making Decisions

Develop Hypotheses and Making Decisions

Below, you will find short descriptions of 3 studies. For each one, provide the following:

The conceptual hypothesis.

The research hypothesis.

The null hypothesis.

A. 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 the number of Facebook friends.

B. 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.

C. 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.

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