zlacker

> … these students were busy taking photos, experimenting with composition and lighting, testing out various methods in the darkroom, and learning from their mistakes.

Why?

Supposedly they would be graded A for exposing 100 frames of the lens-cap.

Presumably the "quantity" group were highly self-motivated individuals invested in developing their skills.

Presumably the "quality" group were also highly self-motivated individuals invested in developing their skills.

    ~

Presumably the "quality" group were free to produce as many photos as they wished.

The difference is that the "quality" group only had once chance to impress the professor.

In contrast, the "quantity" group had at-least 100 chances to impress the professor.

Sampling bias.