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Based on what you know about partial correlation and its uses, think about variables in the following correlational studies that would be prime candidates for control via partial correlation

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Based on what you know about partial correlation and its uses, think about variables in the following correlational studies that would be prime candidates for control via partial correlation.

a. A researcher investigated the charge that there were sex-related salary inequities at the district offices of large urban school districts. As a first step, the researcher calculated the correlation between sex (male, female) and annual salary. What would be an appropriate variable to control via partialing?

b. A researcher investigated the relationship between vocabulary knowledge and head circumference in a population of elementary school children. What would be an appropriate variable to control via partialing?

c. A researcher investigated the suspected relationship between IQ and size of family and found lower IQs among later-born individuals (as the number of brothers and sisters increase, the IQ becomes lower). What would be an appropriate variable to control via partialing?

d. A researcher investigated the relationship between learning disabilities and the consumption of junk food (the more junk food consumed by a child, the greater the learning disability). What would be an appropriate variable to control via partialing?