A. Explain what a third-variable problem is in correlational research and give an…

A. Explain what a third-variable problem is in correlational research and give an example.
B. Relative frequency refers to:
a. The frequency of observed scores in each score category in a distribution.
b. The number of observations in each score category in a distribution expressed as a proportion of the total number of observations in the distribution.
c. The number of observations in each score category in a distribution expressed as an accumulative proportion of the total number of observations in the distribution.
d. None of the options available are correct.