In a case-control study of computer display exposure and glaucoma, cases and controls were also asked about television watching habits. errors in recall of exposure to video screens occurred with equal frequency among cases and controls. what is the most likely effect of this bias on the measure of association reported by the study?

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.

Which type of evidence would support the author's claim?

An object weighs 40n in air , weighs 20n when submerged jn water and 30n submerged in a liquid of unknown density .what is the density of the liquid?