1. A researcher is interested in studying face recognition abilities. Subjects are tested in the lab on their recognition of photos of unknown faces presented on a computer screen. If the subjects...

1. A researcher is interested in studying face recognition abilities. Subjects are tested in the lab on their recognition of photos of unknown faces presented on a computer screen. If the subjects process the photos of the faces in a way that is different from how they typically process faces in their daily lives, this study would suffer from low ____________ validity.

2. Explain why attrition/mortality is a possible source of bias when it occurs in a research study.