We would like you to assess the QUALITY of each of the following argument (discussing Death Penalty) and determine if the argument is Valid or Invalid. A valid argument is clearly interpretable and either expresses an argument, or a premise or a conclusion that can be used in an argument for the topic of death penalty. An invalid argument is a phrase that cannot be interpreted as an argument or not on the topic of death penalty.

Stanford did an experiment on prison rehabilitation and psychology, and had an extremely interesting outcome.
Valid

It is clear keeping them in prsion would be far more expensive in this case.
Valid

And sure it is at a cost to the taxpayer, but whether or not we execute someone should not be dependent upon the relative financial cost.

Valid