RESEARCH STUDY 5.2 Dr. Sheffield Is a Clinical Psychologist Who Specializes in Treating

RESEARCH STUDY 5.2
Dr. Sheffield is a clinical psychologist who specializes in treating pathological gambling. Pathological gambling is defined as being unable to resist impulses to gamble. Bothered by not having a good measure that he can give to clients to determine whether they are suffering from this condition, he creates a new measure of pathological gambling. The measure has 15 questions and it takes 20 minutes to complete.
-Refer to Research Study 5.2 above to answer the following question. Dr.Sheffield decides to test the predictive validity of his measure.Dr.Sheffield gives his measure to a group of people that includes suspected problem gamblers and non-gamblers.Which of the following options below does he need to do in addition to get evidence for predictive validity?

A) Give the measure to a group of people attending Gamblers Anonymous meetings
B) Two months later, ask the same group of people to report how many times they have gambled recently
C) Ask the participants to give their opinion on whether the measure is valid
D) Give a measure of alcohol addiction to the same group of clients
E) None of the above