Attempts: Do No Harm: 4 9. Selecting the appropriate correlation coefficient Aa

Question

Attempts: Do No Harm: 4 9. Selecting the appropriate correlation coefficient Aa Aa For each pair of X and Y variables, decide which correlation coefficient to compute. Assume that the relationship between X and Y is linear Pearson r Spearman rho Biserial Phi x- whether infants in a particular country sleep (predominantly) on their stomachs or on their backs, and Y- the incidence of Sudden Infant Death Syndrome (SIDS) in the country (measured by the ratio of SIDS deaths to births) x = a person's life stress score (number of threatening activities over the past 3 months), and Y the person's number of chronic health problems A high school senior ranks the colleges she has applied to in terms of their attractiveness to her. X- the college's tuition, and Y the attractiveness rank the senior assigns to the college x = whether a person slept with the lights on or off at night as an infant, and Y = whether the person is nearsighted as an adult

Explanation / Answer

1) biserial (as there are only 2 options availble for one variable)

2) pearson r

3) spearman rho (as scores are ranked)

4) phi

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