Vincent: No scientific discipline can study something that cannot be measured, and since happiness is an entirely subjective experience, it cannot be measured.
Vincent's Statements
1. can't be measured → sci discipline can't study 2. happiness is an entirely subjective experience 3. happiness can't be measured 4. (assumes: subjective experiences can't be measured)
Yolanda's Statements
1. Optometry and happiness research rely on subjects' reports of how they feel. 2. Optometry is a scientific discipline
Evaluate
Does Yolanda disagree with any of Vincent's explicit claims?
Does Yolanda suggest ... 1. some scientific disciplines do study something that can't be measured? 2. happiness isn't entirely subjective? 3. happiness can be measured?
Yolanda definitely isn't arguing #2.
It's a little unclear whether "relying on subjects' reports" qualifies as "can be measured" for Yolanda. I would lean towards thinking we're allowed to make that equivalence.
If we're researching happiness, and we try playing Mozart for you over while you eat breakfast, and then we ask to self-report your happiness on a 1 to 10 scale, the number you give us is a measurement. It's a data point.
If Yolanda doesn't think that self-reporting counts as measuring, but she thinks optometry is a scientific discipline, then she thinks that scientific disciplines can study something that can't be measured.
If Yolanda does think that self-reporting counts as measuring, then she thinks that happiness can be measured and thus that subjective experiences can be measured.
Goal
I'd be hoping for the answers to give me more clarity on how to interpret Yolanda's statements.
She's either disagreeing with Vincent's first claim, or she's disagreement with his last claim (and the assumption that got him from claim 2 to claim 3).