If a research interested in attention skills claims that a walk through the park three times a week boosts performance on a cognitive test of attention, what kind of claim is being made? Please explain what you might want to know about a) Internal validity of the research, b) external validity of the research.

If a research interested in attention skills claims that a walk through the park three times a week boosts performance on a cognitive test of attention, what kind of claim is being made? Please explain what you might want to know about a) Internal validity of the research, b) external validity of the research.