The _____ correlation coefficient is used when both variables are measured on a(n) _____ scale of measurement.
a. Spearman; interval
b. Pearson; interval/ratio
c. phi; ordinal
d. point-biserial; ratio
Question 2When a correlation is observed between two variables, this allows us to:
a. describe a relationship between variables.
b. predict from one variable to another.
c. determine that one variable causes changes in the other.
d. both describe relationships and predict from one variable to another.
Question 3If a correlation coefficient that you expected to be fairly high turns out to be very low, you should investigate whether there is a:
a. restrictive range on one or both variables.
b. curvilinear relationship between the variables.
c. third variable inhibiting the relationship.
d. restrictive range on one or both variables and a curvilinear relationship between the variables.
Question 4The problem of _____ can often be identified by using a _____.
a. causality; point-biserial correlation
b. directionality; phi coefficient
c. third variables; partial correlation
d. restrictive range; point-biserial correlation
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