Wendy Is Investigating Differences in Cardiovascular Health Between Children Who

Multiple Choice

Wendy is investigating differences in cardiovascular health between children who are involved in extra-curricular activities and those who are not. She decides to investigate only children who are average height and weight, with no existing heart conditions and no family history of obesity. Wendy has employed which method for controlling the extraneous variable in her study?

A) Matching
B) Comparing homogeneous subgroups
C) Analysis of covariance (ANCOVA)
D) Manipulation of independent variable