One of the preoccupations of quantitative researchers is with generalization, which is a sign of

A quantitative researcher's concern with generalization is a sign of external validity.

Internal reliability concerns the internal consistency of a measure's items.

External reliability concerns the stability of a measure over repeated use.

Internal validity concerns whether a causal claim within the study is sound.

External validity asks whether findings hold beyond the specific study sample.

Random sampling strengthens the external validity of quantitative results.