During the Han dynasty, waterwheels were used to grind grain true/ false

Apsychologist has developed a series of personality inventories and wants to determine if they are valid. one of the scales measures perfectionism, so he asks a colleague for advice on how to establish the validity of this scale. the colleague tells him that if he were to find a sample of people with personality disorder, these people would obtain high scores on a scale that measures perfectionism.

Me with this psychology homework, i’m struggling with it.

Me asap worth brainlieist and 50 points