Expirement or Correlation; Predictor, Independent, Dependent, & Criterion Variables

Expirement or Correlation; Predictor, Independent, Dependent, & Criterion Variables

For each of the research scenarios depicted below (A-E):

State whether the design is an experiment or a correlation.
State the Independent or Predictor variables.
State the Dependent or Criterion variables.

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 relationship between Extraversion score and number of Facebook
friends.

B. A research team is interested in the relationship between arousal and performance, specifically if higher levels of arousal are related to better 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, in milliseconds, 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 percentage of recess time that each child spends aggressing against classmates. The investigator then compares the girls and boys, on the percent time
spent fighting.

D. A research team is interested in the relationship between high-school performance and later income. An investigator ranks 300 members of a graduating class from 1st
to 300th. The investigator then ranks them by salary, from 1st to 300th, five years later. The investigator evaluates the relationship between the 2 sets of ranks.

E. A research team is interested in the relationship between development and cognition. An investigator administers an intelligence test to the same set of individuals
at ages 6, 10, 14, 18, and 22. The data are analyzed to see if the intelligence scores change over the 5 measures.

In your document, please use the letters and numbers to organize your answers (e.g. “A1. The design is… A2. The independent variable is… etc.”)
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