Analysis

For each of the research scenarios depicted below (A-E), state the appropriate inferential statistical

analysis. Choose analyses from the following list:

Within-Participants ANOVA
Between-Participants ANOVA
t Test
Chi Square Test of Independence
Spearman’s r
Pearson’s r
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 (measured on continuous scales).

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, 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 (measured on a continuous scale) 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.

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