Observer bias can threaten which of the following big validities? Group of answer choicesinternal validity and construct validityinternal validity onlyexternal validity and construct validityinternal validity and external validity

Observer bias can threaten both internal validity and construct validity.

Here's why:

1. Internal Validity: This refers to how well an experiment is done, especially whether it avoids confounding. If an observer is biased, they may interpret results according to their expectations, which can affect the cause-effect relationship being studied. For example, if an observer expects a certain group to perform better, they might unconsciously interpret ambiguous results in favor of that group, thus threatening the internal validity.

2. Construct Validity: This refers to the degree to which a test measures what it claims to be measuring. If an observer is biased, they might not accurately measure the construct of interest. For example, if an observer has a certain stereotype about a group, they might interpret their behaviors according to that stereotype, not according to the actual construct being measured. This can threaten the construct validity.

Therefore, observer bias can threaten both internal validity and construct validity.